Brad Pitt's new war movie Fury offers a no-holds-barred view of warfare which some may find hard to stomach - but its director justifies the gore as straightforward realism.

A stuntman was injured by a bayonet during the making of the film, which includes multiple close-up scenes of slaughter, and which has already been turned into a video game.

"War is violent. It's all incredibly realistic," director David Ayer says, adding that a lot of the movie's scenes are based on actual military after-action reports.