Buffalo Soldiers originally were members of the 10th Cavalry Regiment of the United States Army, formed on September 21, 1866, at Fort Leavenworth, Kansas. This nickname was given to the Black Cavalry by Native American tribes who fought in the Indian Wars. The term eventually became synonymous with all of the African American regiments formed in 1866. Although several African American regiments were raised during the Civil War as part of the Union Army (including the 54th Massachusetts Volunteer Infantry and the many United States Colored Troops Regiments), the "Buffalo Soldiers" were established by Congress as the first peacetime all-black regiments in the regular U.S. Army.