Liver Eatin' Johnston's wife (who was pregnant at the time) was actually killed by a random raiding party of Blackfeet not in revenge for a violation of their burial grounds. She was killed in the Spring while Johnston was off trapping and he didn't return to find her body until several months later. He identified the band that had killed her because he recognized a Tennessee rifle he had given her in the possession of a Crow warrior. Also, rather than isolated incidents as shown in the movie, Johnston often recruited other mountain men as well as Indians (particularly Flatheads) to help him with his vendetta. The part about the warriors sent to kill him and told not to return without his scalp was true.
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