Editor's Note: This article originally appeared on Business Insider.

Creating a realistic battle scene — whether it's from World War II or the Napoleonic Wars — demands technical know-how and precise attention to detail.

Paul Biddiss, the military technical adviser on the upcoming World War I movie 1917, taught the actors everything they needed to know, from proper foot care to how to hold a weapon, "which allows the actor to concentrate on his primary task. Acting!" Biddis told Insider.

Biddiss has worked on projects from a variety of time periods — "large Napoleonic battles through to World War I, World War II, right up to modern-day battles with Special Forces," Biddiss said.

Read on to learn about how Biddiss prepared 1917 performers for the gruesome, grueling warfare of World War I.

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