My name is Eric and this is my first post. I didn't want to stick this in the "Sole Survivors" forum because my intention is to add to his existing public record and get to his real story. He was my father's paternal grandmother's uncle (to the best of my recollection). What I know about him (according to my uncle) is that he was a mule skinner. Then there's the claim that came from somewhere about him being the sole-survivor, which is an erroneous claim that somehow made it to his obit.
What I have for you is a scan of a document that is currently in my sister's possession that was created by Pennsylvania author M. I. McCreight, also known as Tchanta Tanka. It is a picture of William Caldwell shaking hands with Chief Eta Wasta. This was found in my grandfather's home after he died, along with the obituary. I contacted the Friends of the Battle of Little Bighorn Battlefield years ago and got the scan below from the book Hammer, Kenneth M. Men With Custer: Biographies of the 7th Cavalry Crow Agency, Montana: Custer Battlefield Historical & Museum Association, 1995. The pension record came from a family search that I performed.