The story of the Salvation Army, told through the tale of two men and two women who serve in the First World War.
Elizabeth Blake, a foundling, grows up on a farm. She has her young life ruined by an unscrupulous landlord's agent. She runs away to the city, where she is rescued by the Salvation Army.
Harry Hammond is engaged to Agnes Traverse. He sits in at a meeting of the Salvation Army, but leaves early because of disinterest. He waits outside for Agnes and her mother, who have also attended. He sees a woman (Elizabeth) being accosted by thugs and goes to her rescue. But they slug him and shanghai him aboard a steamer for France. When the United States enters the war, Elizabeth departs for France as a member of the Salvation Army. Luke Barlow, a farmhand who knew and loved Elizabeth when she was younger, enlists and follows Elizabeth as soon as he can. Meanwhile, Harry has recovered at a Salvation Army station in the war zone, and decides to enter the flying corps.
Agnes has no idea if her fiancé is dead or alive. She signs on to the Salvation Army after her mother dies. When Harry is blinded by an explosion, he is placed in a hospital where Elizabeth works. Elizabeth recognizes Harry as the man who tried to save her, and falls in love with him. But she tells Harry nothing. During a German attack, Harry is left behind in the cellar of an old chateau, along with Elizabeth and Luke Barlow. With the help of a little boy and an old Frenchman, they hold out against the German advance until the Americans and French rescue them. Harry's sight is restored and he marries Agnes. Elizabeth marries Luke, never letting anyone know of her love for Harry.
