Battle of Prairie Dog Creek
1876 CE.
Shown on the map at 45.269°, -106.624°.
The Battle of Prairie Dog Creek, also known as the Skirmish at Tongue River Heights, or the Battle of the Tongue River (1876), part of the Great Sioux War of 1876, occurred on June 9, 1876, at the confluence of Prairie Dog Creek and the Tongue River primarily in Wyoming Territory.
Text from the Wikipedia article Battle of Prairie Dog Creek, licensed CC BY-SA 4.0.