Bandolero!

“There are "Westerns" and "Westerns". Every now and then comes a NEW kind of Western. This is "BANDOLERO!".”

Why does a man ride into a Texas town posing as a hangman when he has come to cheat the gallows? Mace Bishop (James Stewart) means to free a gang of outlaws awaiting execution, among them his younger brother Dee (Dean Martin). Andrew V. McLaglen follows the brothers toward Mexico with Sheriff July Johnson (George Kennedy) close behind, and between Mace and Dee there is a quarrel that neither one lets go.