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 of what had happened to Custer until General Terry's arrival on June 27. They were reportedly stunned by the news. When the army examined the Custer battle site, soldiers could not determine fully what had transpired. Custer's force of roughly 210 men had been engaged by the Lakota and Northern Cheyenne about to the north of Reno and Benteen's defensive position. Evidence of organized resistance included apparent breastworks made of dead horses on Custer Hill. By the time troops came to recover the bodies, the Lakota and Cheyenne had already removed most of their dead from the field. The troops