The Magnificent Seven Ride!

Married and on the side of the law, Marshal Adams (Van Cleef) has settled in Arizona Territory. When his wife (Mariette Hartley) is killed, Chris tracks down the gunmen and administers swift justice but then discovers that a nearby border town is under attack. A ruthless horde of marauders has killed all the men and will come back for the women, unless Chris and his bold recruits can stop them. Outnumbered, but with a steely resolve and an arsenal of firepower, the gunfighters saddle up for the fight of their lives! (official distributor synopsis)