American Horse fought at the Little Bighorn, but he didn’t live long after. On September 9, 1876, troops led by General George Crook attacked American Horse’s Sioux Camp at Slim Buttes, Dakota Territory. It was a route; the Indian leader was mortally wounded by a shot to the abdomen and his camp was destroyed.
But literally holding his intestines in with one hand, American Horse formally surrendered to Crook, showing incredible strength and dignity. He died early the next morning.
https://truewestmagazine.com/far-western-frontier/