One of the highlights of the upcoming epic "Troy" is the fight scene between the two heroes: Achilles (played by Brad Pitt) and Hector (Eric Bana). Director Wolfgang Petersen and the actors decided early on that they didn't want to use stunt doubles for the scene, so the actors spent six months prior to shooting training and getting in shape. Once they were on set they spent another six months learning the choreography for the key scene -- which was shot without the warriors wearing helmets, so that their faces are constantly in full view.

However, Bana didn't realize when he took his helmet off that it would leave him open to a "full-fledged backhand fist to the face" by Pitt, which knocked him to the ground and forced him to take a 20-minute break before he could resume shooting.

"I got quite a few whacks," Bana laughs. "I've got a little Brad Pitt scar here [indicates the side of his nose]; it's a tiny one but it'll be there [for a while]. He felt terrible for luckily for us, it was probably about 85 percent through that fight sequence, because it does dull your confidence."

When reminded of hitting Bana on the set, Pitt asks "Which time?" with a wide, and almost sadistic, grin.

"Did he tell you that money changed hands?" he asks. It turns out that the two actors had a deal that they would each pay the other $50 for any slight infractions, and $100 for major hits. By the time they finished shooting the fight scene -- which took six days -- Pitt had to pay Bana $750. Only $200 was paid to him -- "I hit myself a couple times," Pitt deadpans.

Not only did they not use stunt doubles, but Petersen also insists that they didn't use wireworks for Achilles' trademark move, a high jump combined with a slash of his knife in his opponent's shoulder. It's actually in doing this move for the film's opening fight scene that Pitt, ironically, twisted his Achilles tendon, forcing him to wear a cast and sit out from shooting for nearly 10 weeks.

"Thank God it was late [in production]," Petersen says. "At first he didn't say anything and then he did it again and we saw him sort of [wincing] and limping around. But the shot was done, it was in the can."

Because of Brad's injury, the main fight scene between Hector and Achilles had to be delayed until the actor healed. When it finally took place, it was two months after principal photography on the film had ended.

"It was the last thing we had to do," says Bana. "Post hurricane, post injury, post some second unit stuff -- we were the last two men standing."

Because of the delays, there was added pressure to get the fight scene, which was shot over six days last December, right so that everyone could go home for the holidays.

"This was the last week of the shoot and we finished it on the death nail of the 22nd of December. If we didn't get that last shot it was like, the European crew weren't going home until after Christmas," Bana adds."There was something in the air, we had to get this and if we hadn't of trained as hard as we did we wouldn't of gotten this fight done on time."