Sergio Leone is famous for his spaghetti Westerns, starring Clint Eastwood with scores by Ennio Morricone, and this was his final Western. Starring James Coburn and Rod Steiger, it tells the tale of a Mexican bandit and an Irish revolutionary and explosives expert during the 1910 Mexican revolution.
John Ford's The Searchers (1956) is consistently and deservedly hailed by critics as the greatest western ever made and one of the greatest films of any genre.