British and German police are presenting a united front in South Africa as England take on their arch rivals in the knockout stages of the World Cup.
Uniformed officers from both countries are patrolling together in Bloemfontein in the hope of "setting the tone" for the two sets of supporters.
Assistant Chief Constable Andy Holt, leading the UK delegation, said he would not be able to stop distasteful chanting such as "Ten German Bombers" and "Two World Wars, One World Cup".
But he praised the behaviour of the England fans so far and said he was not predicting any mass disorder.
Mr Holt said: "The fans will see British bobbies paired up with German bobbies.
"We are trying to get the message across loud and clear that we are working together extremely closely.
"Hopefully that will set the tone, but it won't necessarily stop 'Ten German Bombers'."
He continued: "The chants are in poor taste.
"The German fans and German police are well used to hearing those sorts of chants but they show a commendable attitude towards it, in that they just laugh it off.
"I don't think we are going to be able to stop those sort of chants taking place from a small minority of the fans. We've heard them already this World Cup - but not from an overwhelming majority."