That's even worse than They Died with Their Boots On (1941) in which Errol Flynn is Custer.

The mind-boggling thing there is that the scriptwriter didn't want to make Custer *or* the Natives the villains, so all the racism gets displaced onto some other guy who tries to start a gold rush, and the movie ends with Custer and his troops *deliberately* walking into the Little Bighorn because...... their getting killed will help the Natives somehow?

I don't know what was up with Warner Bros. for a year or two there.