Jack Budlong died after falling from his horse onto his sword.
Untrained rider George Murphy was killed when he fell from his horse while drunk.
Because of a shortage of native Americans in Hollywood, Warner Bros. imported 16 Sioux from the Dakotas.
To fill the background with "Indians", hundreds of Filipino extras were filmed while the 16 Sioux were used for the close-ups.
This was the eighth and final film pairing of Errol Flynn with Olivia de Havilland. The last scene they filmed together was Custer's parting with his wife before his final campaign.
The filming of the "Last Stand" sequence from this movie involved some 200 horsemen charging around in pretend battle and was so dangerous that one day during filming Anthony Quinn, who played Crazy Horse, arranged as a gag for a hearse to show up at the filming location