Death Rides the Range

Death Rides the Range (1939) is a action, western directed by Sam Newfield rated 8.0/10.

A wounded archaeologist crawls into the camp of three kindhearted cowboys. When the cowboys bring him to a nearby trading post, he's murdered after he lets slip a secret about a hidden cave. Investigating his death, Ken and his friends encounter a land dispute between a pair of neighboring ranches, an arrogant German baron and a mysterious shack that houses a great secret.