Battle of Dead Buffalo Lake
1863 CE.
Shown on the map at 46.896°, -99.785°.
The Battle of Dead Buffalo Lake was a skirmish in July 1863 in Dakota Territory between United States army forces and Santee, Yankton, Yanktonai and Teton Sioux. The Sioux attempted to capture the pack train of the army and retired from the field when they were unsuccessful.
Text from the Wikipedia article Battle of Dead Buffalo Lake, licensed CC BY-SA 4.0.