Exterior shots were largely filmed throughout England from May to October 1917. Griffith made two trips to France where he filmed footage of the trenches. In one instance Griffith and his film crew were forced to take cover when their location came under German artillery fire; he escaped unscathed. The film company returned to Los Angeles where British and Canadian troops recreated battle scenes and other interior scenes on a stage at Fine Arts Studio in Los Angeles from November to December 1917. The scenes shot in Europe and Los Angeles were edited together with footage from stock newsreels.