In the summer of 1914, Alsatian maiden Louise de Villars is attacked by two German soldiers. Hugh Brown, a visiting American, comes to her rescue and they fall in love. When war is declared, Hugh enlists in the French flying corps and shoots down thirty enemy planes. He is captured, but escapes with other prisoners while being transferred to another camp, and arrives at Louise's house to find camp commander, Baron Von Steinbach. To save Hugh from being executed, Louise offers herself to the lecherous Baron. Louise then kills him and escapes with Hugh to an American trench, where they are married by a chaplain on the final day of the war. Afterward, they leave Europe for Hoboken, New Jersey.