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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.

Many of the same cast and crew members would be hired for Sergio Leone's first credited directorial effort, "The Colossus of Rhodes" (1961).

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."

Director Mario Bonnard reportedly fell ill on the first day of shooting. The film was directed mostly by Sergio Leone, who was one of the screenwriters.

In the 1960s, after Sergio Leone became a name director after the success of his spaghetti westerns, this film was re-released and the credits were changed giving Leone sole director credit.