The Devil's Legion (Last Gunfighter‪)‬

William Johnstone has over a million copies of his popular Westerns in print. Rolling into the small town of San Remo, Frank Morgan and his faithful companion Dog bear witness to a violent range war. Frank gets drawn in deeper when he's recruited by one side against the other. Weary from a life of settling scores with pistols, Morgan sides with the townsfolk and reluctantly accepts their marshal's badge in the hopes of ending the bloodshed.