Shock (movie, 1934)

Captain Bob Hayworth, his brother Lieutenant Gilroy Hayworth and Captain Derek Marbury are in a World-War 1 trench on the front-lines in France. Bob Hayworth resents Marbury greatly as the latter had married the girl, Lucy Neville, Marbury was courting in pre-war London. Ordered to go on a night patrol, the cowardly Gilroy committed suicide rather than face his fear. Bob and Derek arrange it to appear that Bob had been killed by a shell-burst, and Derek, with his face camouflaged, takes the patrol posing as Gilroy. While on patrol, Derek is hit by a shell-burst and found by the German Red Cross, who turn him over to a family of French peasants.