“I also like to point out that this battle took place in Pro-US CROW territory. It can be classed as a massive invasion by their enemies the Sioux, Cheyenne and Arapaho.”
A lot of people don’t realize that.
The Sioux literally invaded the Black Hills too, that was not their “homeland”. I believe their homeland was more Minnesota than anything west of it.
Cheyenne and Arapaho were more traditionally south of Montana and in the plains IIRC.
The Native American tribes did not negotiate when it came to land acquisition. The most powerful tribe took what they wanted. Not a politically correct statement in these woke days.
Forty-five years ago, I took an anthropology class on the North American Indian tribes because it sounded like an interesting elective. It was. I remember the instructor's dissertation was based on the premise that the military power of the tribes could be determined by analyzing the bison ranges. The most powerful tribes sat on the best bison range and kept everyone else out. In the U.S., starting in the north and continuing south, the prime bison range was occupied by the Blackfeet (although most of their territory was in Canada but still prime bison territory), the Dakota, the Pawnee, the Cheyenne and Arapaho, the Kiowa, and the Comanche. The other tribes were basically pushed to the marginal bison range.