Bandolero!

Bandolero is a 1968 western directed by Andrew V. McLaglen starring James Stewart, Dean Martin, Raquel Welch and George Kennedy. The story centers on two brothers on a run from the posse, led by a local sheriff George Kennedy who wants to arrest the runaways and free a hostage Raquel Welch that they took on the way. They head into the wrong territory, which is controlled by Bandoleros.

Dee has taken Maria as a hostage after they come across her wagon, during which Gang member Pop Chaney Will Geer shoots and kills the man escorting Maria. The posse, led by local sheriff July Johnson and deputy Roscoe Bookbinder Andrew Prine, chases the fugitives across the Mexican border into territory policed by bandoleros, whom Maria describes as men out to kill any gringos foreigners that they can find. Maria further warns Dee that the sheriff will follow, because they have taken the one thing that July Johnson has always wanted her.Despite initial protestations, Maria falls for Dee and finds herself in a quandary. She had never felt anything for the sheriff, nor for her husband, who had purchased her from her family. The posse tracks them to an abandoned town and captures the gang. The bandoleros also arrive, shooting and killing Roscoe, so the sheriff releases the outlaws so that the men can fight back in defense. ........

Source: Wikipedia