From 1837-1891 there were 21 total battles between the U.S. Army and all Indians in the United States and its Territories in which 10 or more U.S. soldiers were killed. There were at most 3,800 Cheyennes scattered across the Great Plains during that time period. Maybe 800-900 warriors. Of those 21 battles, the Cheyenne Indians were the opposition in 9.
Truly, until they and their allies were overwhelmed by the sheer size of the U.S. Army, the Cheyenne were the greatest cavalry warriors of their time.