According to Gregory Peck, director William Wyler intended the film to be a left-wing allegory for the Cold War.
Aged 47 at the time of filming, Burl Ives was only 11 years older than Chuck Connors, who played his son.
The film is credited with starting the trend for pacifist westerns.
Charlton Heston initially turned down the role of ranch foreman Steve Leech because he didn't think the part was big enough. His agent convinced him that it would be worth it just for the opportunity to work with Gregory Peck and William Wyler.