This movie is so well known it has become the Robin Hood story.

From IMDB — The Golden Palomino that Olivia de Havilland rides in this film is Trigger, shortly before he became the mount of Roy Rogers. At the time Olivia de Havilland rode the horse, its registered name was "Golden Cloud" and was owned by Hudkins Stables, an outfit that leased horses and Western equipment for films. Roy Rogers bought Golden Cloud for $2,500. Character actor Smiley Burnette, who was Roy's sidekick in his early movies, suggested the name of "Trigger" to Roy, as the horse was "quick-on-the-trigger". Roy rode Trigger in his first starring Western, Under Western Stars (1938).

From IMDB — Heavily padded stunt players and actors were paid $150 per arrow for being shot by professional archer Howard Hill, who also played the captain of the archers, whom Robin Hood defeats in the tournament by splitting his own arrow. Splitting the arrow was Hill's feat, too, done in one take with no trick photography.