4 Dollars Of Revenge

Bandits ambush Capt. Roy Dexter of the U.S. Cavalry while he and his men escort a fortune in Confederate gold coins. Only Dexter survives the attack. He's subsequently sentenced to life in prison on the false belief he masterminded the ambush. Escaping from prison, Dexter sets about tracking down and exposing the true culprits. AKA Cuatro dólares de venganza.