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 with Reno's holding the Indians at bay at the southern end of the camp, while Custer drove them against Reno's line from the north. Other historians have noted that if Custer did attempt to cross the river near Medicine Tail Coulee, he may have believed it was the north end of the Indian camp, although it was only the middle. Some Indian accounts, however, place the Northern Cheyenne encampment and the north end of the overall village to the left (and south) of the opposite side of the crossing. The precise location of the north end of the village remains