The Man from Colorado (1948)
The Man from Colorado is a 1948 American western-psychological drama film directed by Henry Levin and produced by Jules Schermer for Columbia Pictures. It stars Glenn Ford as a Union officer who becomes addicted to killing during the American Civil War, William Holden as his best friend, and Ellen Drew as their common love interest. Robert Andrews and Ben Maddow based the screenplay on a story by Borden Chase.
More at Wikipedia.