- Over 200 horses were killed during filming, resulting in the US Congress passing new laws to protect animals used in motion pictures.
- During filming, director Michael Curtiz exclaimed "Bring on the empty horses!", meaning "riderless horses". 'Niven, David' would later use this phrase as the title of his autobiography. See also Casablanca (1942).
- The original script used the real-life siege of a British fort at Cawnpore (and subsequent massacre of its survivors) during the Sepoy Rebellion--a nationwide mutiny of Indian soldiers in the British army--as the reason for the famous Charge of the Light Brigade at Balaklava during the Crimean War. However, shortly before the film was started, someone pointed out that the Sepoy Rebellion took place three years AFTER the Crimean War. The fort's name was hurriedly changed to Chukoti, and instead of mutinous Indian soldiers, the besiegers were changed to tribesmen of a fictitious warlord called Surat Khan.
- During the filming of the charge sequence, a stuntman was killed when he fell off his horse and landed on a broken sword that was lying on the field where the charge was being shot, and was unfortunately wedged in such a position that its blade was sticking straight up.
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