Sanin County is located in the south of the Great Wall Yanmenguan is Yanmenguan inside and outside the choke, it is "north gate lock and key," said.
Many famous generals, such as Li Mu Zhao, Meng Tian Qin, Han Wei Qing, Li, Huo, Song Yang industry, Ming Yu Qian and so had stationed troops stationed in this, a surprise move which smote the enemy. Therefore we can say, Kwong Wu Tunbing great historical fort and military value.