S1·E19 Warpath

The buffalo hunters, led by Tom Cardigan, are persecuting little Billy Bright in the saloon because he used to be married to a Shoshone Indian. The Shoshone are on the warpath because Cardigan killed the chief's brother. Troop stops them and then lets Bright go, but then he learns that the buffalo men hung Bright outside of town. He goes to try to stop a war, and the Indians attack him and the buffalo hunters.