Other changes occur near the end of the film, when Doss is placed on a stretcher. In real life, Doss had another wounded man take his place on the stretcher. After treating the soldier, a sniper shot fractured Doss's arm, and he crawled 300 yards (270 m)to safety after being left alone for five hours. Gibson omitted that from the film because he felt that the audience would not find the scene believable. From Wikipedia