Hour of the Gun

Hour of the Gun is a 1967 Western film depicting Wyatt Earp and Doc Holliday during their 1881 battles against Ike Clanton and his brothers in the Gunfight at the O.K. Corral, and the gunfights aftermath in and around Tombstone, Arizona, starring James Garner as Earp, Jason Robards as Holliday, and Robert Ryan as Clanton. The movie was directed by John Sturges.

Outnumbered but determined, Wyatt Earp James Garner, his brothers Virgil Frank Converse and Morgan Sam Melville and ally Doc Holliday Jason Robards confront and clearly get the best of the Ike Clanton gang in a violent shootout at the O.K. Corral in the Arizona town of Tombstone.Ike Robert Ryan, a rustler, conspires to have the Earps charged with murder and tried in a court of law. When they are cleared, Virgil runs for Tombstone City Sheriff, but is ambushed and maimed by some of Clantons hired guns. Morgan elects to take the job in his brothers place, but, unlike his brother, he is killed. ........

Source: Wikipedia