Chances (1931)

Two brothers, Jack and Tom, are in love with the same woman, Molly. While the two brothers go off to war and Molly does her part in the effort, Tom believes that Molly is waiting for him, while in fact, she loves Jack and only turned to Tom on the rebound. Jack and Molly meet while he is on leave, and when he returns to battle, he doesn't know how to handle the situation with Tom.