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Speaking to DS, Sheridan said that the Spider-Man star visited a Marine Corps base in Virginia and went on a crash diet to prepare himself for the drama.
"We went to Camp Pendleton and a few army bases and we spoke to a few marines," Sheridan commented. "Over Christmas he went on a diet and exercised every day. We had a two-week break and he lost 20lbs."
Sheridan added that his working relationship with Maguire's co-star Jake Gyllenhaal was initially difficult.
"I think we both realised we'd always be fighting to be the centre of attention - two mammie's boys it's called on the set!" he explained. "But he's a sweetheart and after I'd got used to him I adored him. He's easy to work with."
> Click here to read our full interview with Jim Sheridan
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