Old Mexican-American sheriff Bob Valdez has always been a haven of sanity in a land of madmen when it came to defending law and order. But the weapon smuggler Frank Tanner is greedy and impulsive. When Tanner provokes a shooting that causes the death of an innocent man and Valdez asks him to financially compensate the widow, Tanner refuses to do so and severely humiliates Valdez, who will do justice and avenge his honor, no matter what it takes.
Johnny was mentally traumatised when he witnessed as a child the killing of his father (a deserter) by a group of soldiers. As an adult he randomly kills every soldier he gets hold of, so that the army sends out the brutish Lieutenant Garringo to stop Johnny.
El Chuncho's bandits rob arms from a train, intending to sell the weapons to Elias' revolutionaries. They are helped by one of the passengers, Bill Tate, and allow him to join them, unware of his true intentions.
