Battle of Qi Mountains
214 CE.
Shown on the map at 33.396°, 104.919°.
The Battle of Qi Mountains was fought in 214 CE between the forces of the warlords Cao Cao and Zhang Lu. The battle was part of Ma Chao's multiple attacks on Cao Cao following the Battle of Tong Pass in 211.
Text from the Wikipedia article Battle of Qi Mountains, licensed CC BY-SA 4.0.