Battle of the Belly River
1870 CE.
Shown on the map at 49.694°, -112.861°.
The Battle of the Belly River was the last major conflict between the Cree (the Iron Confederacy) and the Blackfoot Confederacy, and the last major battle between First Nations on Canadian soil.
Text from the Wikipedia article Battle of the Belly River, licensed CC BY-SA 4.0.