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 he kept the largest. His men were widely scattered and unable to support each other. Wanting to prevent any escape by the combined tribes to the south, where they could disperse into different groups, Custer believed that an immediate attack on the south end of the camp was the best course of action. Criticism of Custer was not universal. While investigating the battlefield, Lieutenant General Nelson A. Miles wrote in 1877, "The more I study the moves here [on the Little Big Horn], the more I have admiration for Custer." Facing major budget cutbacks, the U.S. Army wanted to avoid