After the sinking of the Lusitania , American James Garrison "Garry" Owen joins the British army and fights gallantly until he is wounded and subsequently discharged. Recuperating in New York, he meets and falls in love with Helen Lloyd, and the two plan to be married after his return from active duty with the American forces in France. Helen's brother Albert, fighting in France under Garry's command, panics and deserts his post, whereupon Garry is forced to report him. At the court-martial, Albert is sentenced to death, but when Company D is attacked, his heroic actions save the day and he dies a hero. Meanwhile, Helen is abducted by German officer Friederich von Emden, whose submarine transports her to his headquarters, Madame Arnot's chateau in Belgium. Von Emden captures Garry and orders him to attend a banquet celebrating the German's forced marriage to Helen, but an old servant named Sonia poisons most of the German guests. Garry kills von Emden and then escapes with Helen to the Allied lines.