Death Valley Outlaws

Death Valley Outlaws (1941) is a western directed by George Sherman rated 9.0/10.

Ambushed by the Vigilantes, a dying friend gets Johnny who was only passing through to take up the fight. To get in with the gang, Johnny poses as an outlaw and then beats them to a gold shipment by robbing the train ahead of them. This gets him invited into the gang. They are all masked and unknown to Johnny, one of them is his brother.