Rio Conchos (1964)

When a shipment of repeating rifles is stolen from the U.S. Cavalry, Capt. Haven (Stuart Whitman) and Sgt. Franklyn are sent to recover them and enlist the aid of an alcoholic former confederate and Indian hater, James Lassiter (Richard Boone) and a Mexican murderer, Rodriguez (Tony Franciosa). Lassiter, who owns one of the rifles, says it came from his embittered former commander Col. Pardee, while an Apache woman informant reveals that Pardee intends to sell the stolen arms to her people.