The Vigilantes Ride (1943)

"THE VIGILANTES ARE COMING! Watch the shooting! the fighting! the excitement! IT'S THRILLING !"

When Rangers Lucky and his brother chase outlaws, the brother is killed. To find the killer Lucky quits the Rangers and robs the bank. This gets him into the outlaw gang where he learns of their next raid. Sneaking out at night he tells his girl friend who must now convince the Sheriff that Lucky is not an outlaw and that he must sent his men out to catch the gang.