The Redhead and the Cowboy (1951)

Gil Kyle finds himself caught up in the politics and unrest of the American Civil War and soon gets himself framed for a murder. His only alibi is Candace Bronson, who is aiding the Confederate cause and has left the territory to deliver a vital message about a Yankee gold shipment. So he sets off in pursuit, running into desperados, government agents, and guerrilla fighters, who are more interested in profit than ideals.