Who doubled Tyrone Power in the riding scenes?

Although Tyrone Power rode fairly well, the hard riding scenes (particularly in the day for night scenes) almost certainly had to have been done by a stuntman. The way the rider sits a horse strongly suggests Dave Sharpe (look up his filmography and you'll understand). However, I can find no evidence linking Sharpe to this production. He often worked uncredited as a stuntman, but that proves nothing. Does anyone happen to know?