Reva, South Dakota Reva, South Dakota Reva is an unincorporated community in Harding County, South Dakota, United States. Although not tracked by the Census Bureau, Reva has been assigned the ZIP code of 57651. The community has the name of Reva Bonniwell, the daughter of a first settler. The Battle of Slim Buttes occurred here on September 9–10, 1876, in the Great Sioux Reservation between the United States Army and Miniconjou Sioux during the Great Sioux War of 1876. It marked the first significant victory for the Army since the stunning defeat of General George Custer at the Battle of Little Bighorn in
Battle of the Little Bighorn made by several groups. Custer's remaining companies (E, F, and half of C) were soon killed. By almost all accounts, the Lakota annihilated Custer's force within an hour of engagement. David Humphreys Miller, who between 1935 and 1955 interviewed the last Lakota survivors of the battle, wrote that the Custer fight lasted less than one-half hour. Other native accounts said the fighting lasted only "as long as it takes a hungry man to eat a meal." The Lakota asserted that Crazy Horse personally led one of the large groups of warriors who overwhelmed the cavalrymen in a surprise charge from