Actually Greg F none of it is made up at all, I referenced the following to confirm this.
Your local library may well have copies of the books.

Ruling Pine Ridge. Akim Reihardt Lubbock: Texas Tech University Press.(2007)

In the Spirit of Crazy Horse. Peter Mathiessen New York: Viking.(1991)

The Dull Knives of Pine Ridge. Joe Starita New York: G.P. Putnam's Sons
(1995)