Tom Hiddlestone in War Horse
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War Horse star Tom Hiddlestone on Spielberg and Guinness

13 January 2012 Last updated at 11:16 GMT

Tom Hiddlestone, who plays Captain Nicholls in Steven Spielberg's World War I movie War Horse, spoke to BBC Breakfast about his role and the challenges he faced riding a horse in the battle scenes.

The actor was nominated this week for a Bafta rising star award.