Allan Dwan

John Wayne, a tough Marine sergeant, takes recruits and makes them Marines. He does it with discipline and authority ... and with his fists when he has to. The men begin to understand when they see him in action and he earns their respect.

Sierra Nevada Jones, a feisty young woman, attempts to stake her claim in the cattle business despite threats from greedy land grabbers and their hired killers. Undercover agent Farrell comes to her rescue, even though he is in the midst of a separate investigation to find out who's been provoking the local Indian tribes into attacking the whites.