Jamie Bell has revealed his budding friendship with Channing Tatum during rehearsals for The Eagle almost put the epic film "in jeopardy".
The pair - who are now close pals in real life - play enemies in the new action movie, with the Billy Elliot actor starring as Esca, the British slave of Channing's powerful Roman soldier Marcus Aquila.
"When we first started rehearsals it was obvious we were going to get along incredibly well, which was kind of putting the film in jeopardy to a degree because we're supposed to hate each other, we're supposed to be complete enemies," Jamie said.
"But we had a lot of fun... I think for both of us we enjoyed the experience very much and got back to childhood, running around with swords, going around on horseback in Scotland. It was a dream for us."
While the two characters start out as foes, a close bond develops as they go in search of the emblem of a lost Roman legion.
Scottish director Kevin MacDonald joked that The Eagle - in UK cinemas on Friday March 25 - was "a little bit of a bromance".
He added: "Channing was sort of big, all-American and chiselled, and Jamie was small and kind of wiry, European.
"The two of them are this odd couple and that's really what the film's about, this odd couple who hate each other but then become the best of friends by the end of it."