Go with God, Gringo(1966)

The Cris brothers kill Gringo's brother and frame Gringo and his friend, Mexico, for a murder. They are taken to jail and along with the four bandits who are the real killers, escape and reach a village in which a fair is being held. Someone recognizes them and they must leave taking a dancer, Carmen, as a hostage. Gringo tries to protect her and is left in the desert all alone. Meanwhile the bandits rob a mail-coach and kill the escorts with Gringo hot on their trail. Source: SWDB www.spaghetti-western.net