When a wandering mercenary named Hogan rescues a nun called Sister Sara from the unwanted attentions of a band of rogues on the Mexican plains, he has no idea what he has let himself in for. Their chance encounter results in the blowing up of a train and a French garrison, as well as igniting a spark between them that survives a shocking discovery.

Gringo miner Gallager is caught up in the Mexican revolution of 1910-11 when corrupt administrator Ruiz appropriates his mine. Gallager saves the life of guerilla leader Raquel, then finds there's a price on his head; he becomes romantically involved with her in the course of a series of rescues and ambushes, leading up to Orozco's march on Ciudad Juarez.

A gringo gunman and two Mexican families fight a bandit and his gang.