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 before he died. Having isolated Reno's force and driven them away from the encampment, the bulk of the native warriors were free to pursue Custer. The route taken by Custer to his "Last Stand" remains a subject of debate. One possibility is that after ordering Reno to charge, Custer continued down Reno Creek to within about a half-mile (800 m) of the Little Bighorn, but then turned north and climbed up the bluffs, reaching the same spot to which Reno would soon retreat. From this point on the other side of the river, he could see Reno charging the village.