Just finished a book by a guy called Joseph Marshall a Lakota who’s written a fictionalised account of the run up to the rosebud/little big horn battles. It’s a good read but not much new on the actual fighting.
There’s a lot of very interesting little details though that sound like they’ve been passed down - nearly every warrior has a pistol, many have binoculars, these aren’t remarked on, but everybody is short of bullets. Warriors have whip rounds to give a couple of rounds each to guys who are short. Some little anecdotes/sub plots that would make interesting skirmish scenarios as well. Called “the long knives are crying “