Battle of the Big Hole
1877 CE.
Shown on the map at 45.648°, -113.651°.
The Battle of the Big Hole was fought in Montana Territory, August 9–10, 1877, between the United States Army and the Nez Perce tribe of Native Americans during the Nez Perce War. Both sides suffered heavy casualties. The Nez Perce withdrew in good order from the battlefield and continued their long fighting retreat that would result in their attempt to reach Canada and asylum. Located in Beaverhead County, the battle site is between the continental divide at Chief Joseph Pass and the town of Wisdom.
Text from the Wikipedia article Battle of the Big Hole, licensed CC BY-SA 4.0.