The Deserter (1971)

Description

An Army Captain deserts the cavalry after Apaches murder his wife, which he blames on army negligence. He leaves his post and heads off to live in the southwestern wastelands to hunt down the men responsible. When the army discovers the Apaches have set up a camp inside Mexico, they track down the captain and offer him amnesty in exchange for training and leading a group of men to the attack the Apaches.