What is the nickname the native Americans gave african-American army men?

"Buffalo Soldiers" is a nickname originally bestowed upon the members of the U.S. 10th Cavalry Regiment of the United States Army by the Native American tribes they were fighting, the term eventually encompassed these units: * U.S. 9th Cavalry Regiment * U.S. 10th Cavalry Regiment * 24th Infantry Regiment * 25th Infantry Regiment * 27th Cavalry Regiment * 28th Cavalry Regimen