Rider of the Law (1935)

⁣Marshal Bob Marlow arrives in Apache City posing as a dude. The six Tolliver brothers are running wild and when Bob fights with two of them they accidentally shoot each other. Then a third brother goes after him and is accidentally shot when they fight. When Bob's identity is revealed, the other three and the rest of the gang rob the bank and flee. No longer a dude, Bob organizes a posse to go after them.