Battle of Big Mound
1863 CE.
Shown on the map at 47.024°, -99.629°.
The Battle of Big Mound was a United States Army victory in July 1863 over the Santee Sioux Indians allied with some Yankton, Yanktonai and Teton Sioux in Dakota Territory.
Text from the Wikipedia article Battle of Big Mound, licensed CC BY-SA 4.0.