The ancient Yanmenguan was a battleground for military strategists. Where is Yanmenguan? Please talk about the history of Yanmenguan. Thank you very much

Yanmenguan, also known as Xiguan, is located in Yanmen Mountain, about 20 kilometers north of Daixian County, Xinzhou City, China Province. It is an important pass on the Great Wall, and it is called "Outer Three Passes" together with Ning Wuguan and Pianguan.

Xiongguan Yanmen ranks first among the "Nine Wonders in the World" (Lu Chunqiu). Since King Wuling of Zhao in the Warring States Period, all previous dynasties have regarded this place as a strategic place. Zhao set up Yanmen County, and from then on Yanmen was organized as a county, a road and a county. The name of Yanmenguan began in the early Tang Dynasty. Due to the rise of the Turks in the north, there are many internal conflicts in China. Tang Shoujun was stationed in Yanmen Mountain and set up a city at the iron-wrapped gate at the commanding height to guard the soldiers. Geography in the Book of the Tang Dynasty describes here that "the east and west mountains are steep, with a road in the middle and extremely rugged near the top, which is called Xiluguan, also known as Yanmenguan." After five dynasties and ten kingdoms, Song, Liao, Jin and Yuan dynasties, it lasted more than 400 years. Thousands of houses were built in the Yuan Dynasty, and Guancheng was destroyed. In the seventh year of Hongwu (1374), Hou Lu of Ji 'an in Ming Dynasty supervised migrant workers to build a new access road ten miles northeast of Jiuguan. It is more than forty miles away from Daicheng county in the south and twenty-one miles away from Guangwu ancient city in the north. The terrain is more dangerous. Yanmenguan in the late Ming and early Qing Dynasties

Gu Zeng, a famous scholar, personally visited here. He wrote: "The Wild Goose Gate is closed again, and the mountain is there. Xia Yunfei, the two mountains are opposite. It is shaped like a door, and the flying geese come out. " Guancheng, with a circumference of two miles, a wall two feet high, a stone pedestal and a brick body, serrated teeth and three holes, is called the East Gate, the West Gate and the Small North Gate. There is a balcony on the east gate, named Wild Goose Pagoda, and there is a stone tablet embedded at the door, which reads "natural barrier" (that is, "natural barrier"). Yang Liulang Temple was built in the west gate, and there is a stone tablet at the main entrance, with the words "geographical location" (that is, "geographical location") written horizontally. Xiaobeimen has no top floor, but the masonry structure is exceptionally strong. The stone tablet on the threshold is engraved with the word "Yanmenguan". Bricks are inlaid on both sides of the cave gate, and regular script is engraved: "The three levels must be unparalleled, and the meatballs respect the first level." On the north side outside the East Gate, there is a "Jingbian Temple" dedicated to the Warring States strategist Li Mu. There is Guandi Temple on the right outside the west gate. There are garrison barracks in the north and Yanmenguan in the southeast.

There is a training ground. The whole Guancheng building, surrounded by tigers and dragons, is magnificent. After Ming and Qing Dynasties, Guancheng was rebuilt frequently. However, with the gradual formation of China's multi-ethnic unified national territory, the role of the Inner Great Wall as an "inner border" has been lost, and its Yanmen Xiongguan has also been abandoned. At present, Guancheng is only located in three doorways: East Gate, West Gate and Xiaobeimen, a pair of stone lions in front of Jingbian Temple, a stone flagpole, a stone tablet inscribed by Li Mu in Ming Dynasty, and several pine trees behind the temple.