Ancient military defense is very dependent on the guan pass city pool, an important pass can often be worth thousands of troops and horses, we can often hear the saying of zhen shou three passes in various deductive novels, so what does this three passes refer to, in the Yang family will be in the novel Yang Ye led his sons to guard the three passes to defend the country, these three passes are Yanmen Pass, Ningwu Pass, and Partial Head Pass.
Yanmen Pass has a very important military significance in the history of our country, almost all the emperors of all dynasties will deploy heavy troops in Yanmen Pass, because the geographical location of Yanmen Pass is too important, in the early years of the Han Dynasty, there is a cool official who is very famous, he is Zhi Du, and most of the cool officials are some mean and ruthless people.
The emperor appointed them in order to rectify the rule of officials, Andi Du had served as the Taishou of Yanmen Gate, and the place where he was stationed was Yanmen Pass, and although he was a cool official, he could often win victories when fighting against the Xiongnu, and the Xiongnu retreated as soon as they heard his name.
Empress Dowager Dou later insisted on executing Zhi Du, and Emperor Jingdi of Han argued that he was a hero and should not have killed him, but at Empress Dou's insistence, Zhi Du was still killed. After learning of the death of Zhi Du, the Xiongnu invaded Yanmen on a large scale, in fact, as early as the time of King Wuling of Zhao, Yanmen had become an important military fortress, and the Great Wall built by the Zhao State on the border was to defend against the Xiongnu, and Yanmen Pass became the forward base for the Zhao army to launch an attack on the Xiongnu.
Yanmen Pass is a famous pass in china's ancient history, the Central Plains Dynasty stationed a large army in Yanmen Pass to guard against the nomadic people in the north, in addition to Yanmen Pass, Ningwu Pass and Biaotou Pass are also very important passes. Ningwu Pass is in the territory of present-day Ningwu County, Shanxi, and it was here that the Sanguan Town Guard was established during the Ming Dynasty, and the Ming Dynasty drove the Mongol army back to the grassland at the beginning of the founding of the Country.
The famous generals Xu Da and Chang Yuchun beat the Mongol army breathlessly, although the Mongol army retreated to the depths of the steppe, but it still posed a great security threat to the Ming Dynasty, the Ming Dynasty also deliberately set up a nine-sided town, Ningwuguan as the garrison of the three guan, where there are a large number of Ming troops, they are stationed here to guard against the Mongol tribes in the north.
Ningwu Pass is the northern nomads most often choose a route of attack, because the Yanmen Pass has the obstruction of the mountains, so it is difficult for the cavalry to break through from here, there is no big mountain around Ningwu Pass, and there are rivers around, as long as it is not winter cavalry can pass, so the defense of Ningwu Pass is particularly important, if you do not set up a pass here, the nomadic army can drive straight in, threatening the rule of the Central Plains Dynasty, Yanmen Pass, Ningwu Pass, Andu Pass as an important pass in the north, It played a huge role in ancient Chinese history.