During World War I, musical star Jimmy Canfield shows no interest in fighting, to the disgust of his fiancée Mary Harper. General Harper, her father, accuses Jimmy of being a coward and stipulates that he must join the army or stop seeing Mary. Then when he learns that Bernice Pearce plans to bring a breach of promise suit against him, Jimmy pretends to be joining the army to avoid the suit but accidentally finds himself actually enlisted. In France, he discovers that Hobson, his valet, is a sergeant, while he himself is only a private. The only bright spot is Yvonne, an attractive waitress in a nearby cafe. Mary arrives at the front with her father and is pleased to see Jimmy there, and her response makes Yvonne jealous, even though Jimmy denies that Mary is his girl friend. Then, when Bernice arrives with a group of entertainers, Yvonne is madder than ever. Jimmy takes a room in Yvonne's house without knowing that her stepfather is a spy. He accidentally releases their carrier pigeons and is arrested for espionage. Jimmy later manages to escape from his prison by pretending to be an officer, a disguise that backfires when he is ordered to the front to capture a German machine gun nest. He is knocked out by a blast just before he arrives and when he comes to, he puts on a German helmet. He takes the Germans prisoner, finding that all the soldiers on the front are tired of fighting and are eager to surrender. At first, when he returns with the Germans, the Allies think Jimmy is a spy, but when they understand, he is decorated for capturing the Germans and Yvonne decorates him with a kiss.