Northern Nebraska just south the Niobrara river, In mid 1980's I'd walked back from some field work (bunching stack butts in the west hay meddow with a Farmall hay sweep) in need of a new governor spring I walked back and took a shortcut by taking a cow path down through a old ravine sand wash (Nebraska Sandhills) sticking out the sand was a spur rowel, I pulled out a old rusty spur, thinking it was kinda neat I brought it home and put it on the dash board of the pickup truck, went back and finished my work, later on a neighbor saw the rusty spur and was excited, said it was a civil war era army spur, close to a mile to the south and east of where I found the spur is a old Pawnee winter camp.
That winter camp just looked like bull holes* scatterd on the south slope of some hills in the pasture down the road, lots of arrow heads laying round if you know how to look for them.
* -A bull hole is circular depression 6-10 feet in diameter and a foot or so deep in a pasture created by a Bull digging up sand to flick on its back to get rid of flies.