Battle of Wancheng
197 CE.
Shown on the map at 33.007°, 112.537°.
The war between Cao Cao and Zhang Xiu was fought between the warlords Cao Cao and Zhang Xiu between 197 and 199 in the late Eastern Han dynasty of China. It concluded with Zhang Xiu's surrender to Cao Cao.
Text from the Wikipedia article War between Cao Cao and Zhang Xiu, licensed CC BY-SA 4.0.