The plot revolves around three heroes, played by Fred MacMurray, Albert Dekker, and Gilbert Roland, as they battle a ruthless land baron who is intent on driving out small ranchers and settlers.

A firing squad in Mexico is just about to be the end of former Army officer Gil Farra, former prizefighter George Bird and caballero Antonio Sierra when they get a last-second reprieve.

Along the trail, riding for the U.S. border, the men encounter a young woman known as "Squib" and her grandfather, Homer Clayborn, a newspaper publisher.

He's been run out of the town of Santa Marta, where townspeople have come under the thumb of a wealthy landowner, Colonel Rebstock.

Squib writes a newspaper editorial denouncing Rebstock, then is killed, with her office set ablaze.