Escape from Fort Bravo(1953)

1863. "Captain Roper" (Holden) is an officer of the northern army who is in charge of the southern prisoners in a fort in Arizona. He is hated by the southerners and even his own train mates because of his harsh behavior towards prisoners and fugitives. Until "Carla Forrester" (Parker) comes to the castle for the wedding of her friend, the commander's daughter. But he is actually a southern spy...