Wow! That’s a great story!
I read this story a couple of years ago, but forgot in which book it was. Turned out it was in ‘the veteran’. Story 5 in the book, In my opininion the best.
It’s kind of a ‘time-travelling’ story, but not in anyway like the SF of BTTF stories.
‘Forsyth’s tale of the Indian wars in 1876, in which we discover that a frontier scout survived the massacre at the Little Bighorn. The scout’s love for a Cheyenne woman, a magical tale that spans two different historical periods, makes for compulsive reading.’
You can buy it here