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 as Custer's Crow scouts reported Sioux tribe members were alerting the village. Ordered to charge, Reno began that phase of the battle. The orders, made without accurate knowledge of the village's size, location, or the warriors' propensity to stand and fight, had been to pursue the Native Americans and "bring them to battle." Reno's force crossed the Little Bighorn at the mouth of what is today Reno Creek around 3:00 pm on June 25. They immediately realized that the Lakota and Northern Cheyenne were present "in force and not running away." Reno advanced rapidly across the open field towards the