During production, Steve Reeves suffered a major injury. A chariot he was driving struck a tree and he dislocated his shoulder. The injury never fully healed, putting an end to the more intense bodybuilding routines he had done for most of his life.
It was reportedly during the production of this film that Sergio Leone, Sergio Corbucci and Duccio Tessari were introduced to the deserts of Spain. This would inspire their use of these locations for the genre that would be known as "spaghetti westerns."