"Brennan seems to have met his match in director John Ford. Scott Eyman, a Ford biographer, reports that the usually easygoing Brennan allowed the irascible director to get on his nerves. "Can't you even mount a horse?" Ford shouted at Brennan, when the actor had trouble saddling up. "No, but I got three Oscars for acting," Brennan shot back. Eyman speculates that perhaps Brennan, who was unusually solemn on the set, transferred his hatred of Ford to his maniacal performance as Old Man Clanton. At any rate, Brennan vowed never to work with Ford again."