Shanxi Guangwutunbing Ancient Castle Review

Many famous generals such as Li Mu of Zhao, Meng Xu of Qin Dynasty, Wei Qing of Han Dynasty, Li Guang, Huo Gosick, Yang Ye of Song Dynasty, Yu Qian of Ming Dynasty, etc. have been stationed here in the Tun soldiers, and have been surprisingly successful in killing enemy troops.

It is the throat of the anus gate inside and outside, so it is called the "North Gate Lock Key".