Siege of Jicheng
213 CE.
Shown on the map at 34.740°, 105.330°.
The siege of Jicheng was a part of the campaign Ma Chao initiated in an attempt to retake Liang Province after the coalition of Guanxi (west of Hangu Pass) was defeated at the Battle of Tong Pass in the winter of 211 in the late Eastern Han dynasty.
Text from the Wikipedia article Siege of Jicheng, licensed CC BY-SA 4.0.