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Battle of the Somme's legacy 'should be work towards reconciliation'

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Queen Elizabeth II and the Duke of Edinburgh arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

Queen Elizabeth II and the Duke of Edinburgh arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

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The Queen leaves Westminster Abbey in London after a service to commemorate the centenary of the Battle of the Somme.

The Queen leaves Westminster Abbey in London after a service to commemorate the centenary of the Battle of the Somme.

Queen Elizabeth II and the Duke of Edinburgh arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

The Battle of the Somme's legacy should see people working towards reconciliation to ensure today's children never endure what the First World War soldiers faced, the Bishop of London has said.

On the eve of the battle's 100th anniversary the Right Reverend Dr Richard Chartres told a Westminster Abbey congregation which included the Queen, Duke of Edinburgh and David Cameron that they should strive to reach an accord and reject "those who would stir up hatred and division".

The evening service in tribute to the fallen heralded the start of events in the UK and France commemorating the battle which began on July 1 1916 - a day that became the bloodiest in British military history with almost 20,000 dead.

It was intended to be a decisive victory for the British and French against Germany's forces but by the end of the four-month campaign in northern France, more than a million soldiers had been killed and wounded on both sides and the First World War would drag on for another two years.

The Duke and Duchess of Cambridge and Prince Harry paid their respects in France, attending a vigil at Thiepval Memorial where 70,000 British and Commonwealth soldiers with no known grave are commemorated.

In his address Dr Chartres quoted the famous words of Irishman Thomas Kettle, a nationalist, economist and poet who was an officer with the 9th Royal Dublin Fusiliers and was killed at the Somme.

The Bishop said: "'Used with the wisdom that is sown in tears and blood, this tragedy of Europe may be and must be the prologue to the two reconciliations of which all statesmen have dreamed; the reconciliation of Protestant Ulster with Ireland and the reconciliation of Ireland with Great Britain.'

"Our prayer must be that with the wisdom sown in blood and tears we may be agents of the reconciliation which is God's will, reconciliation wherever we live or from wherever we come, rejecting those who would stir up hatred and division and instead working for the reconciliation that will ensure that our children will never have to endure what the men of the Somme so bravely endured."

The first day of the Battle of the Somme became the bloodiest in British military history with more than 57,000 casualties recorded - of these 19,240 were fatalities.

Among the worst hit were the "pals" battalions, volunteer units of limited fighting experience.

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A gun salute during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. (Photo bt Yui Mok - Pool/Getty Images)

A gun salute during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. (Photo bt Yui Mok - Pool/Getty Images)

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Britain's Prince Charles (R) and Britain's Prime Minister David Cameron attend a a memorial ceremony on July 1, 2016 at the Thiepval Memorial, northern France, during which Britain and France mark the 100 years since soldiers emerged from their trenches to begin one of the bloodiest battles of World War I (WWI) at the River Somme. / AFP PHOTO / POOL / Francois MoriFRANCOIS MORI/AFP/Getty Images

Britain's Prince Charles (R) and Britain's Prime Minister David Cameron attend a a memorial ceremony on July 1, 2016 at the Thiepval Memorial, northern France, during which Britain and France mark the 100 years since soldiers emerged from their trenches to begin one of the bloodiest battles of World War I (WWI) at the River Somme. / AFP PHOTO / POOL / Francois MoriFRANCOIS MORI/AFP/Getty Images

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THIEPVAL, FRANCE - JULY 01:  War graves at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on July 1, 2016 in Thiepval, France. Today marks exactly 100 years since the beginning of the battle of the Somme.  (Photo by Chris Jackson/Getty Images)

THIEPVAL, FRANCE - JULY 01: War graves at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on July 1, 2016 in Thiepval, France. Today marks exactly 100 years since the beginning of the battle of the Somme. (Photo by Chris Jackson/Getty Images)

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BEAUMONT-HAMEL, FRANCE - JULY 1: Prince Charles, Prince of Wales lays a wreath at the Beaumont-Hamel Newfoundland Memorial during a Ceremony of Remembrance hosted by the Government of Canada to mark the 100th anniversary of the start of the battle of the Somme on July 1, 2016 in Beaumont-Hamel, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Niall Carson - Pool/Getty Images)

BEAUMONT-HAMEL, FRANCE - JULY 1: Prince Charles, Prince of Wales lays a wreath at the Beaumont-Hamel Newfoundland Memorial during a Ceremony of Remembrance hosted by the Government of Canada to mark the 100th anniversary of the start of the battle of the Somme on July 1, 2016 in Beaumont-Hamel, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Niall Carson - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1: French President Francois Hollande meets British and French school children during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo bt Yui Mok - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: French President Francois Hollande meets British and French school children during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo bt Yui Mok - Pool/Getty Images)

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MANCHESTER, ENGLAND - JULY 01:  Chancellor of the Exchequer George Osborne MP attends a commemoration service at Manchester Cathedral marking the 100th anniversary since the start of the Battle of the Somme. July 1, 2016 in Manchester, England. Services are being held across Britain and the world to remember those who died in the Battle of the Somme which began 100 years ago on July 1st 1916. Armies of British and French soldiers fought against the German Empire leading to over one million lives being lost.  (Photo by Christopher Furlong - WPA Pool/Getty Images)

MANCHESTER, ENGLAND - JULY 01: Chancellor of the Exchequer George Osborne MP attends a commemoration service at Manchester Cathedral marking the 100th anniversary since the start of the Battle of the Somme. July 1, 2016 in Manchester, England. Services are being held across Britain and the world to remember those who died in the Battle of the Somme which began 100 years ago on July 1st 1916. Armies of British and French soldiers fought against the German Empire leading to over one million lives being lost. (Photo by Christopher Furlong - WPA Pool/Getty Images)

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Handout photo issued by the MOD of a gun salute by 206 (Ulster Battery Royal Artillery) at the Somme Memorial in Thiepval Barracks, Northern Ireland, to mark the 100th anniversary of the start of the battle of the Somme. PRESS ASSOCIATION Photo. Issue date: Friday July 1, 2016. See PA story HERITAGE Somme BelfastEvents. Photo credit should read: Kellie Shattock/MOD/PA Wire

NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.

Handout photo issued by the MOD of a gun salute by 206 (Ulster Battery Royal Artillery) at the Somme Memorial in Thiepval Barracks, Northern Ireland, to mark the 100th anniversary of the start of the battle of the Somme. PRESS ASSOCIATION Photo. Issue date: Friday July 1, 2016. See PA story HERITAGE Somme BelfastEvents. Photo credit should read: Kellie Shattock/MOD/PA Wire NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.

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MANCHESTER, ENGLAND - JULY 01:  Royal british Legion standard bearers attend a commemoration service at Manchester Cathedral marking the 100th anniversary since the start of the Battle of the Somme. July 1, 2016 in Manchester, England. Services are being held across Britain and the world to remember those who died in the Battle of the Somme which began 100 years ago on July 1st 1916. Armies of British and French soldiers fought against the German Empire leading to over one million lives being lost.  (Photo by Christopher Furlong - WPA Pool/Getty Images)

MANCHESTER, ENGLAND - JULY 01: Royal british Legion standard bearers attend a commemoration service at Manchester Cathedral marking the 100th anniversary since the start of the Battle of the Somme. July 1, 2016 in Manchester, England. Services are being held across Britain and the world to remember those who died in the Battle of the Somme which began 100 years ago on July 1st 1916. Armies of British and French soldiers fought against the German Empire leading to over one million lives being lost. (Photo by Christopher Furlong - WPA Pool/Getty Images)

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MANCHESTER, ENGLAND - JULY 01:  Prince Andrew, Duke of York, attends a commemoration service at Manchester Cathedral marking the 100th anniversary since the start of the Battle of the Somme. July 1, 2016 in Manchester, England. Services are being held across Britain and the world to remember those who died in the Battle of the Somme which began 100 years ago on July 1st 1916. Armies of British and French soldiers fought against the German Empire leading to over one million lives being lost.  (Photo by Christopher Furlong - WPA Pool/Getty Images)

MANCHESTER, ENGLAND - JULY 01: Prince Andrew, Duke of York, attends a commemoration service at Manchester Cathedral marking the 100th anniversary since the start of the Battle of the Somme. July 1, 2016 in Manchester, England. Services are being held across Britain and the world to remember those who died in the Battle of the Somme which began 100 years ago on July 1st 1916. Armies of British and French soldiers fought against the German Empire leading to over one million lives being lost. (Photo by Christopher Furlong - WPA Pool/Getty Images)

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Press Eye handout photo of the Band of the Irish Guards taking part in a wreath-laying ceremony at the Cenotaph in the grounds of Belfast City Hall to commemorate the 100th anniversary of the Battle of he Somme. PA

Press Eye handout photo of the Band of the Irish Guards taking part in a wreath-laying ceremony at the Cenotaph in the grounds of Belfast City Hall to commemorate the 100th anniversary of the Battle of he Somme. PA

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Press Eye handout photo of Belfast Lord Mayor, Alderman Brian Kingston taking part in a wreath-laying ceremony at the Cenotaph in the grounds of Belfast City Hall to commemorate the 100th anniversary of the Battle of he Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme. Photo credit should read: Kelvin Boyes/Press Eye/PA Wire

NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.

Press Eye handout photo of Belfast Lord Mayor, Alderman Brian Kingston taking part in a wreath-laying ceremony at the Cenotaph in the grounds of Belfast City Hall to commemorate the 100th anniversary of the Battle of he Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme. Photo credit should read: Kelvin Boyes/Press Eye/PA Wire NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.

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THIEPVAL, FRANCE - JULY 1:  Serviceman watch footage of soldiers from the battle of the Somme during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Serviceman watch footage of soldiers from the battle of the Somme during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  Serviceman watch footage of soldiers from the battle of the Somme during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Serviceman watch footage of soldiers from the battle of the Somme during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  Standard bearers during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Standard bearers during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  A view of the wreath laying ceremony during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: A view of the wreath laying ceremony during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  A Union flag and French tricolour fly during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: A Union flag and French tricolour fly during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Chris Radburn - Pool/Getty Images)

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A man dressed as a First World War soldier in Walthamstow, London, to mark 100 years since the start of the Battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. The imitation soldiers surprised onlookers by stopping to pose and sing wartime songs, and when not singing, the men remained silent, handing out cards with names of those who had died to members of the public. See PA story HERITAGE Somme Tributes. Photo credit should read: Nitya Kanoria/PA Wire

A man dressed as a First World War soldier in Walthamstow, London, to mark 100 years since the start of the Battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. The imitation soldiers surprised onlookers by stopping to pose and sing wartime songs, and when not singing, the men remained silent, handing out cards with names of those who had died to members of the public. See PA story HERITAGE Somme Tributes. Photo credit should read: Nitya Kanoria/PA Wire

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THIEPVAL, FRANCE - JULY 1: The Prince of Wales at the Ulster Memorial Tower in Thiepval, France, during a service to mark the 100th anniversary of the start of the battle of the Somme on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Niall Carson - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: The Prince of Wales at the Ulster Memorial Tower in Thiepval, France, during a service to mark the 100th anniversary of the start of the battle of the Somme on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Niall Carson - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1: Wreaths at the Ulster Memorial Tower in Thiepval, France, during a service to mark the 100th anniversary of the start of the battle of the Somme on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Niall Carson - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Wreaths at the Ulster Memorial Tower in Thiepval, France, during a service to mark the 100th anniversary of the start of the battle of the Somme on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Niall Carson - Pool/Getty Images)

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Men dressed as First World War soldiers in Euston station, London, to mark 100 years since the start of the Battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. The imitation soldiers surprised onlookers by stopping to pose and sing wartime songs, and when not singing, the men remained silent, handing out cards with names of those who had died to members of the public. See PA story HERITAGE Somme Tributes. Photo credit should read: Sarah Perry/PA Wire

Men dressed as First World War soldiers in Euston station, London, to mark 100 years since the start of the Battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. The imitation soldiers surprised onlookers by stopping to pose and sing wartime songs, and when not singing, the men remained silent, handing out cards with names of those who had died to members of the public. See PA story HERITAGE Somme Tributes. Photo credit should read: Sarah Perry/PA Wire

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The Duke and Duchess of Cambridge tour the new Thiepval Memorial to the Missing Visitors Centre in Thiepval, France. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme Royals. Photo credit should read: Ian Jones/PA Wire

The Duke and Duchess of Cambridge tour the new Thiepval Memorial to the Missing Visitors Centre in Thiepval, France. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme Royals. Photo credit should read: Ian Jones/PA Wire

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(left to right) French President Francois Hollande and the Duke and Duchess of Cambridge arrive to open the new Thiepval Memorial to the Missing Visitors Centre in Thiepval, France. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme Royals. Photo credit should read: Ian Jones/PA Wire

(left to right) French President Francois Hollande and the Duke and Duchess of Cambridge arrive to open the new Thiepval Memorial to the Missing Visitors Centre in Thiepval, France. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme Royals. Photo credit should read: Ian Jones/PA Wire

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THIEPVAL, FRANCE - JULY 1: Detailed view of the note on the wreath left by Labour leader Jeremy Corbyn  at the Stone of Remembrance after the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Andrew Matthews - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Detailed view of the note on the wreath left by Labour leader Jeremy Corbyn at the Stone of Remembrance after the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Andrew Matthews - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  Actress Joely Richardson speaks during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Actress Joely Richardson speaks during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1: Detailed view of the note on the wreath left by Prime Minister David Cameron   at the Cross of Sacrifice after the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Andrew Matthews - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Detailed view of the note on the wreath left by Prime Minister David Cameron at the Cross of Sacrifice after the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Andrew Matthews - Pool/Getty Images)

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The Prince of Wales and the Duchess of Cornwall are given a tour at Beaumont-Hamel, France, following a Ceremony of Remembrance, hosted by the Government of Canada to mark the 100th anniversary of the start of the battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme. Photo credit should read: Niall Carson/PA Wire

The Prince of Wales and the Duchess of Cornwall are given a tour at Beaumont-Hamel, France, following a Ceremony of Remembrance, hosted by the Government of Canada to mark the 100th anniversary of the start of the battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Friday July 1, 2016. See PA story HERITAGE Somme. Photo credit should read: Niall Carson/PA Wire

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THIEPVAL, FRANCE - JULY 1:  (L-R) Prince Charles, Prince of Wales with Camilla, Duchess of Cornwall and Prime Minister David Cameron during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: (L-R) Prince Charles, Prince of Wales with Camilla, Duchess of Cornwall and Prime Minister David Cameron during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1: School children take part in a procession in the rain holding flowers a wreaths during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo bt Yui Mok - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: School children take part in a procession in the rain holding flowers a wreaths during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo bt Yui Mok - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  Prince Charles, Prince of Wales speaks during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Prince Charles, Prince of Wales speaks during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

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THIEPVAL, FRANCE - JULY 1:  Poppies fall on a Military Service person during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

THIEPVAL, FRANCE - JULY 1: Poppies fall on a Military Service person during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Steve Parsons - Pool/Getty Images)

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THIEPVAL, FRANCE - JUNE 30:  Soldiers take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France.  (Photo by Chris Jackson/Getty Images)

THIEPVAL, FRANCE - JUNE 30: Soldiers take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France. (Photo by Chris Jackson/Getty Images)

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LONDON, ENGLAND - JUNE 30: Prince Philip, Duke of Edinburgh and Queen Elizabeth II attend a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Prince Philip, Duke of Edinburgh and Queen Elizabeth II attend a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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War graves are lit  during part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Steve Parsons/PA Wire

War graves are lit during part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Steve Parsons/PA Wire

PA

LONDON, ENGLAND - JUNE 30: Five civilians and five members of the military undertake a Vigil at Grave of the Unknown Warrior after the Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Five civilians and five members of the military undertake a Vigil at Grave of the Unknown Warrior after the Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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War graves are lit  during part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PA

War graves are lit during part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PA

PA

THIEPVAL, FRANCE - JUNE 30:  Major General Peter Kelly, Head of the New Zealand Forces takes part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France.  (Photo by Chris Jackson/Getty Images)

THIEPVAL, FRANCE - JUNE 30: Major General Peter Kelly, Head of the New Zealand Forces takes part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France. (Photo by Chris Jackson/Getty Images)

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Soldiers stand at the Stone of Remembrance during a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Gareth Fuller/PA Wire

Soldiers stand at the Stone of Remembrance during a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Gareth Fuller/PA Wire

PA

Soldiers take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France.  (Photo by Chris Jackson/Getty Images)

Soldiers take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France. (Photo by Chris Jackson/Getty Images)

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Prince Harry gives a reading as part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Yui Mok/PA Wire

Prince Harry gives a reading as part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Yui Mok/PA Wire

PA

LONDON, ENGLAND - JUNE 30: Prime Minister David Cameron and wife Samantha arrive to attend a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Prime Minister David Cameron and wife Samantha arrive to attend a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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THIEPVAL, FRANCE - JUNE 30:  Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing in June 30, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Tim Rooke - Pool/Getty Images)

THIEPVAL, FRANCE - JUNE 30: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing in June 30, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo by Tim Rooke - Pool/Getty Images)

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THIEPVAL, FRANCE - JUNE 30: The Duke and Duchess of Cambridge and Prince Harry attend part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing in June 30, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Yui Mok - Pool/Getty Images)

THIEPVAL, FRANCE - JUNE 30: The Duke and Duchess of Cambridge and Prince Harry attend part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing in June 30, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Yui Mok - Pool/Getty Images)

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THIEPVAL, FRANCE - JUNE 30:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge  take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France.  (Photo by Chris Jackson/Getty Images)

THIEPVAL, FRANCE - JUNE 30: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations on June 30, 2016 in Thiepval, France. (Photo by Chris Jackson/Getty Images)

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LONDON, ENGLAND - JUNE 30: Five civilians and five members of the military undertake a Vigil at Grave of the Unknown Warrior after the Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Five civilians and five members of the military undertake a Vigil at Grave of the Unknown Warrior after the Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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LONDON, ENGLAND - JUNE 30: Queen Elizabeth II lays a wreath made of roses and bay leaves on the Grave of the Unknown Warrior at a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Queen Elizabeth II lays a wreath made of roses and bay leaves on the Grave of the Unknown Warrior at a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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LONDON, ENGLAND - JUNE 30: Prime Minister David Cameron and wife Samantha speak before a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Prime Minister David Cameron and wife Samantha speak before a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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LONDON, ENGLAND - JUNE 30: Leader of the Labour Party Jeremy Corbyn attends a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 30: Leader of the Labour Party Jeremy Corbyn attends a Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, United Kingdom. (Photo by Niklas Halle'n - WPA Pool/Getty Images)

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Soldiers take part in a vigil at the the Stone of Remembrance as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Andrew Matthews/PA Wire

Soldiers take part in a vigil at the the Stone of Remembrance as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Andrew Matthews/PA Wire

PA

ALBERT, FRANCE JUNE 30: A general view of the Thiepval Memorial as Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry attend the Somme Centenary commemorations on June 30, 2016 in Albert, France. (Photo by Tim Rooke - Pool/Getty Images)

ALBERT, FRANCE JUNE 30: A general view of the Thiepval Memorial as Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry attend the Somme Centenary commemorations on June 30, 2016 in Albert, France. (Photo by Tim Rooke - Pool/Getty Images)

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ALBERT, FRANCE JUNE 30: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry attend the Somme Centenary commemorations at the Thiepval Memorial on June 30, 2016 in Albert, France. (Photo by Tim Rooke - Pool/Getty Images)

ALBERT, FRANCE JUNE 30: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry attend the Somme Centenary commemorations at the Thiepval Memorial on June 30, 2016 in Albert, France. (Photo by Tim Rooke - Pool/Getty Images)

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The Duke and Duchess of Cambridge and Prince Harry attend part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Yui Mok/PA Wire

The Duke and Duchess of Cambridge and Prince Harry attend part of a military-led vigil to commemorate the 100th anniversary of the beginning of the Battle of the Somme at the Thiepval memorial to the Missing, as part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Yui Mok/PA Wire

PA

The Duke and Duchess of Cambridge and Prince Harry receiving a historical briefing on the battlefields of the Somme from the top of the Thiepval monument in France to mark the centenary of the Battle of the Somme.   PRESS ASSOCIATION Photo. Issue date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Tim Rooke/PA Wire

The Duke and Duchess of Cambridge and Prince Harry receiving a historical briefing on the battlefields of the Somme from the top of the Thiepval monument in France to mark the centenary of the Battle of the Somme. PRESS ASSOCIATION Photo. Issue date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Tim Rooke/PA Wire

PA

Security before the Duke and Duchess of Cambridge and Prince Harry received a historical briefing on the battlefields of the Somme from the top of the Thiepval monument in France to mark the centenary of the Battle of the Somme.   PRESS ASSOCIATION Photo. Issue date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Tim Rooke/PA Wire

Security before the Duke and Duchess of Cambridge and Prince Harry received a historical briefing on the battlefields of the Somme from the top of the Thiepval monument in France to mark the centenary of the Battle of the Somme. PRESS ASSOCIATION Photo. Issue date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: Tim Rooke/PA Wire

PA

Lance Sergeant Stuart Laing from the Welsh Guards rehearses the Last Post on a bugle that was sounded at the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, England. The bugle will be played from the Lantern Tower at Westminster Abbey during a service on the eve of the Battle of the Somme centenary attended by the Queen. The bugle is kept at the Welsh Guards Regimental HQ at Wellington Barracks in London and was used daily along the reserve line as an efficient way of communicating orders. (Photo by Jack Taylor/Getty Images)

Lance Sergeant Stuart Laing from the Welsh Guards rehearses the Last Post on a bugle that was sounded at the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, England. The bugle will be played from the Lantern Tower at Westminster Abbey during a service on the eve of the Battle of the Somme centenary attended by the Queen. The bugle is kept at the Welsh Guards Regimental HQ at Wellington Barracks in London and was used daily along the reserve line as an efficient way of communicating orders. (Photo by Jack Taylor/Getty Images)

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An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

Philip Magowan

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

Philip Magowan

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

Philip Magowan

Queen Elizabeth II and the Duke of Edinburgh arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

Queen Elizabeth II and the Duke of Edinburgh arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

PA

Prime Minister David Cameron and wife Samantha Cameron attend Service on the eve of the centenary of The Battle of The Somme at Westminster Abbey on June 30, 2016 in London, England.  (Photo by Eamonn M. McCormack/Getty Images)

Prime Minister David Cameron and wife Samantha Cameron attend Service on the eve of the centenary of The Battle of The Somme at Westminster Abbey on June 30, 2016 in London, England. (Photo by Eamonn M. McCormack/Getty Images)

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Jeremy Corbyn and his wife Laura Alvarez arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

Jeremy Corbyn and his wife Laura Alvarez arrive at Westminster Abbey in London for a service to commemorate the centenary of the Battle of the Somme. PA

PA

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownards. The sound of bagpipes filled the air at Helen's Tower, as lone piper, Grahame Harris, played a lament. Picture: Philip Magowan / PressEye

Philip Magowan

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownardsy. Starting at 7pm on Thursday evening, the vigil will end at 7.28am on Friday morning, to the blowing of whistles. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownardsy. Starting at 7pm on Thursday evening, the vigil will end at 7.28am on Friday morning, to the blowing of whistles. Picture: Philip Magowan / PressEye

Philip Magowan

ALBERT, FRANCE - JANUARY 30:  A memorial is seen in the town in front of the Basilica of Notre-Dame de Brebieres on January 30, 2016 in Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history.  (Photo by Matt Cardy/Getty Images)

ALBERT, FRANCE - JANUARY 30: A memorial is seen in the town in front of the Basilica of Notre-Dame de Brebieres on January 30, 2016 in Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history. (Photo by Matt Cardy/Getty Images)

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An overnight vigil at the Somme Museum and Heritage Centre outside Newtownardsy. Starting at 7pm on Thursday evening, the vigil will end at 7.28am on Friday morning, to the blowing of whistles. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum and Heritage Centre outside Newtownardsy. Starting at 7pm on Thursday evening, the vigil will end at 7.28am on Friday morning, to the blowing of whistles. Picture: Philip Magowan / PressEye

Philip Magowan

LONDON, ENGLAND - JUNE 30: The Abbey Choir rehearse after Lance Sergeant Stuart Laing from the Welsh Guards rehearsed the Last Post on a bugle that was sounded at the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, England. The bugle will be played from the Lantern Tower at Westminster Abbey during a service on the eve of the Battle of the Somme centenary attended by the Queen. The bugle is kept at the Welsh Guards Regimental HQ at Wellington Barracks in London and was used daily along the reserve line as an efficient way of communicating orders. (Photo by Jack Taylor/Getty Images)

LONDON, ENGLAND - JUNE 30: The Abbey Choir rehearse after Lance Sergeant Stuart Laing from the Welsh Guards rehearsed the Last Post on a bugle that was sounded at the Battle of the Somme at Westminster Abbey on June 30, 2016 in London, England. The bugle will be played from the Lantern Tower at Westminster Abbey during a service on the eve of the Battle of the Somme centenary attended by the Queen. The bugle is kept at the Welsh Guards Regimental HQ at Wellington Barracks in London and was used daily along the reserve line as an efficient way of communicating orders. (Photo by Jack Taylor/Getty Images)

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People in kilt play bagpipes during a ceremony to commemorate the centenary of the battle of the Somme, one of the deadliest of the World War I (1.2 million killed, missing and wounded in five months), on June 30, 2016 in Albert, northern France. / AFP PHOTO / FRANCOIS NASCIMBENIFRANCOIS NASCIMBENI/AFP/Getty Images

People in kilt play bagpipes during a ceremony to commemorate the centenary of the battle of the Somme, one of the deadliest of the World War I (1.2 million killed, missing and wounded in five months), on June 30, 2016 in Albert, northern France. / AFP PHOTO / FRANCOIS NASCIMBENIFRANCOIS NASCIMBENI/AFP/Getty Images

AFP/Getty Images

Colour Sergeant Trevor Ross takes delivery of wreaths from the Mayor of Thiepval, at the Ulster Memorial Tower in Thiepval, France, ahead of the Commemoration of the Centenary of the Battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. Thousands of soldiers from across Ireland died at the Somme, including many from the 36th Ulster Division on the first day of battle. See PA story HERITAGE Somme NIreland. Photo credit should read: Niall Carson/PA Wire

Colour Sergeant Trevor Ross takes delivery of wreaths from the Mayor of Thiepval, at the Ulster Memorial Tower in Thiepval, France, ahead of the Commemoration of the Centenary of the Battle of the Somme. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. Thousands of soldiers from across Ireland died at the Somme, including many from the 36th Ulster Division on the first day of battle. See PA story HERITAGE Somme NIreland. Photo credit should read: Niall Carson/PA Wire

PA

An overnight vigil at the Somme Museum outside Newtownards. Pictured at the vigil is, Jim Shannon MP, John Morrison of the Royal British Legion, military bugler, Grahame Harris of Harris Piping, and Kingsley Donaldson, secretary of the Northern Ireland 1st World War centenary committee. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum outside Newtownards. Pictured at the vigil is, Jim Shannon MP, John Morrison of the Royal British Legion, military bugler, Grahame Harris of Harris Piping, and Kingsley Donaldson, secretary of the Northern Ireland 1st World War centenary committee. Picture: Philip Magowan / PressEye

Philip Magowan

An overnight vigil at the Somme Museum outside Newtownards. Pictured at the vigil is, Jim Shannon MP, John Morrison of the Royal British Legion, military bugler, Grahame Harris of Harris Piping, and Kingsley Donaldson, secretary of the Northern Ireland 1st World War centenary committee. Picture: Philip Magowan / PressEye

An overnight vigil at the Somme Museum outside Newtownards. Pictured at the vigil is, Jim Shannon MP, John Morrison of the Royal British Legion, military bugler, Grahame Harris of Harris Piping, and Kingsley Donaldson, secretary of the Northern Ireland 1st World War centenary committee. Picture: Philip Magowan / PressEye

Philip Magowan

ALBERT, FRANCE - JANUARY 30:  A memorial is seen in the town in front of the Basilica of Notre-Dame de Brebieres on January 30, 2016 in Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history.  (Photo by Matt Cardy/Getty Images)

ALBERT, FRANCE - JANUARY 30: A memorial is seen in the town in front of the Basilica of Notre-Dame de Brebieres on January 30, 2016 in Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history. (Photo by Matt Cardy/Getty Images)

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Liam Mercer, 20, from Elm Park, in Hornchurch, Essex, of the 10th Essex living historians group, in the uniform of a British soldier from WW1, prepares to march through Albert, in France, as part of the of the Commemoration of the Centenary of the Battle of the Somme, in France. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: David Wilcock/PA Wire

Liam Mercer, 20, from Elm Park, in Hornchurch, Essex, of the 10th Essex living historians group, in the uniform of a British soldier from WW1, prepares to march through Albert, in France, as part of the of the Commemoration of the Centenary of the Battle of the Somme, in France. PRESS ASSOCIATION Photo. Picture date: Thursday June 30, 2016. See PA story HERITAGE Somme. Photo credit should read: David Wilcock/PA Wire

PA

ALBERT, FRANCE - JANUARY 30:  A memorial is seen in the town in front of the Basilica of Notre-Dame de Brebieres on January 30, 2016 in Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history.  (Photo by Matt Cardy/Getty Images)

ALBERT, FRANCE - JANUARY 30: A memorial is seen in the town in front of the Basilica of Notre-Dame de Brebieres on January 30, 2016 in Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history. (Photo by Matt Cardy/Getty Images)

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ALBERT, ENGLAND - MAY 18:  Headstones of fallen British servicemen are seen in the Caterpillar Valley Cemetery on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary.  The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day.  (Photo by Matt Cardy/Getty Images)

ALBERT, ENGLAND - MAY 18: Headstones of fallen British servicemen are seen in the Caterpillar Valley Cemetery on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary. The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day. (Photo by Matt Cardy/Getty Images)

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ALBERT, ENGLAND - MAY 17:  A poppy is left besides the names of fallen soldiers  in the Caterpillar Valley Cemetery on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary.  The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day.  (Photo by Matt Cardy/Getty Images)

ALBERT, ENGLAND - MAY 17: A poppy is left besides the names of fallen soldiers in the Caterpillar Valley Cemetery on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary. The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day. (Photo by Matt Cardy/Getty Images)

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ALBERT, FRANCE - MAY 17: The 51st (Highland) Division memorial is seen at the Newfoundland Memorial Park at Beaumont Hamel on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary.  The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day.  (Photo by Matt Cardy/Getty Images)

ALBERT, FRANCE - MAY 17: The 51st (Highland) Division memorial is seen at the Newfoundland Memorial Park at Beaumont Hamel on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary. The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day. (Photo by Matt Cardy/Getty Images)

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ALBERT, ENGLAND - MAY 18:  Headstones of fallen British servicemen are seen in the Caterpillar Valley Cemetery on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary.  The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day.  (Photo by Matt Cardy/Getty Images)

ALBERT, ENGLAND - MAY 18: Headstones of fallen British servicemen are seen in the Caterpillar Valley Cemetery on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary. The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day. (Photo by Matt Cardy/Getty Images)

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ALBERT, FRANCE - MAY 17:  The remains of trenches are seen in the Newfoundland Memorial Park at Beaumont Hamel on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary.  The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day.  (Photo by Matt Cardy/Getty Images)

ALBERT, FRANCE - MAY 17: The remains of trenches are seen in the Newfoundland Memorial Park at Beaumont Hamel on May 17, 2016 near Albert, France. This year will see the 100th anniversary of the start of the Battle of the Somme with a series of major ceremonies planned across the UK and France on July 1 to mark its centenary. The Somme was one of the bloodiest battles of World War One with more than one million casualties over 141 days. The fighting began just before 7.30am on the morning of July 1, 1916 and was to become known as the British Army's bloodiest day. (Photo by Matt Cardy/Getty Images)

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ALBERT, FRANCE - JANUARY 31:  A view of the Gordon Cemetery, Mametz is seen on January 31, 2016 near Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history.  (Photo by Matt Cardy/Getty Images)

ALBERT, FRANCE - JANUARY 31: A view of the Gordon Cemetery, Mametz is seen on January 31, 2016 near Albert, France. This year will mark the 100th anniversary of the start of the World War One Battle of the Somme and a number of commemorations are planned to mark one of the bloodiest battles in military history. (Photo by Matt Cardy/Getty Images)

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A gun salute during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. (Photo bt Yui Mok - Pool/Getty Images)

Many were told to walk slowly across no man's land, resulting in massive numbers of dead as they headed straight into German machine gun fire.

The Bishop highlighted some of the facts from the military engagement - how the Allied bombardment before the attack, which failed to disrupt the enemy, could be heard from the south coast and how German forces were astonished by the Allied forces walking towards them when the battle began.

He added how Corporal Wood of the 16th battalion, West Yorkshire Regiment, recalled the moment they went over the top: "'We were told that the wire had been cut in front of our front line, that there'd be no difficulty at all for us to get through and that there wouldn't be a German within miles.'"

Dr Chartres highlighted the Abbey's overnight vigil which followed the service and was centred on the Grave of the Unknown Warrior - the first time the place of worship had hosted such an event since the peace vigils for the Cuban Missile Crisis more than 50 years ago.

He said: "As we keep our vigil by the graveside of the Unknown Warrior who represents all those who perished in the Great War, it is for us to remember the fearful beginning of the battle of the Somme and to salute the courage and sacrifice of those who went over the top."

During the service prayers were said for the First World War dead and hymns were sung by the congregation who included descendants of the men who fought at the Somme.

The Queen symbolically touched a wreath that was placed at the Grave of the Unknown Warrior and the first watch took up its place - one person, head bowed as a mark of respect, at each corner of the tomb, with their numbers drawn throughout the all-night vigil from UK and Commonwealth military personnel and members of community groups representing those involved in the battle.

During the service the Last Post was played with a bugle that had been used at the Somme.

Welsh Guardsman Lance Sergeant Stuart Laing, 39, sounded the moving tune from the Lantern Tower - the first time music had been performed from the eaves of the Abbey.

The soldier, who spent eight weeks practising with the 101-year-old instrument, said later: "It was an enormous privilege to be the person to sound the Last Post on the eve of the 100th anniversary.

"I'm very proud to have been chosen and I'm bursting with pride."

Sergeant Rob Porteous, of 167 Catering Support Regiment, Royal Logistic Corps, will take up his place in the vigil in the early hours of Friday morning.

His great-grandfather George Taylor was a sergeant with the Tyneside Scottish regiment - one of the "pals" units that featured friends that joined up together.

Sgt Porteous said: "My great-grandfather was a working man in the coal pits who was called up to do something extraordinary and after the war went back to his ordinary life down the pit.

"That's amazing what he did for democracy and peace in Europe."

The final watch around the grave will begin at 7.15am on Friday and just over 15 minutes later - at the moment the whistles blew to signal the start of the battle - a trench whistle will be blown in the Abbey before a short service begins.