To ensure authenticity, director Lewis Milestone instructed the studio to try to find out if there were any World War I German army veterans living in the Los Angeles area, so he could have them authenticate German uniforms, equipment, etc. So many were found that Milestone cast a lot of them as German officers in the film, and had them drill the extras playing German troops (the scene where they are laying communication wire in the forward trenches was led by a former German soldier whose job during the war was to do exactly that).

Film

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