Marshal Wyatt Earp kills a couple of men of the Clanton-gang in a fight. In revenge Clanton's thugs kill the marshal's brother. Thus, Wyatt Earp starts to chase the killers together with his friend Doc Holliday.

Chino Valdez is a loner horse breeder living in the old west. Partly a loner by choice, and partly because, being a 'half-breed', he finds himself unwelcome almost everywhere he goes. One day, a young runaway named Jimmy shows up at his door looking for work and a roof over his head. Reluctantly, Chino agrees to take him in and teach him the art of raising, breaking and breeding horses, until the pair finally begin to accept each other.

A wagon train heads for Denver with a cargo of whisky for the miners. Chaos ensues as the Temperance League, the US cavalry, the miners and the local Indians all try to take control of the valuable cargo.