Hour of the Gun accuracy than most motion picture accounts of the events and is based on the non-fiction book "Tombstone's Epitaph" by Douglas D. Martin, with a screenplay by Edward Anhalt. In "Hour of the Gun" Ike Clanton is shown, correctly, to have survived the Gunfight at the O.K. Corral, whereas previous films had him killed at the gunfight. 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
Wyatt Earp use Frank Waters' "Earp Brothers of Tombstone", as their primary source for material that presents Wyatt Earp as something of a villainous monster, aided and abetted by his brothers who were almost brutes. Waters detested the Earps so badly that he presented a book that was terribly flawed, poorly edited, and brimming with prevarications. In his other work, Waters is poetic. In the "Earp Brothers of Tombstone", he is little more than a tabloid hack, trying to slander someone he dislikes. To date, no reason has been uncovered for the bias Frank Waters exhibited against Wyatt Earp and his brothers.