Shoot-Out at Medicine Bend

Army veterans, just mustered out of the service, are going to the one of the men's brothers ranch on their way West. Just as they arrive, Indians attack the ranch and kill the brother. The brother was killed because he was using faulty ammunition that did not fire. Buck Devlin, whose brother was killed, musters out of the service with pals John and Wilbur and vows to find the men responsible for the crime.