In the Ming Dynasty, eunuchs were rampant and chaos in government was a common phenomenon. Moreover, during the Ming Dynasty, the border defense in the north was indeed a bit weak. This was not only related to the Ming Dynasty's militia system, but also It is also related to its financial system. Moreover, as for the armies of those ethnic minorities, they have been galloping on the grasslands, and their personal military strength is much more powerful than that of the Ming Dynasty.

The military system of the Ming Dynasty also had problems. Most of the soldiers in the Ming Dynasty were militiamen. Officers and soldiers were hereditary, and some needed farming. Such an army basically has no time to train. Although it is 10 times the army, its military strength is indeed relatively weak. Moreover, the hidden dangers of the Ming Dynasty's border defense had already begun to be buried when Yongle was Xuande. In the first year of Yongle, Emperor Yongle's mistake was to move the Daning Dusi inland, and the geographical location under the command of Daning Dusi was very Importantly, this reason directly led to the weak border defense of the Ming Dynasty.

During the Yongle period, Emperor Chengzu of the Ming Dynasty moved thousands of households inland and lost 300 miles of land, making Xuanfu the front line. Since then, Xuanfu has become too isolated. In the fifth year of Xuande, he had to do something Give up. In this way, the northern defense line of the Ming Dynasty changed from the original straight line to a circuitous curve, which lengthened the defense line, increased the difficulty of defense, and was already at a disadvantage in terms of defensive geographical location.

In other words, in the confrontation between farming civilization and nomadic civilization, it is inevitable that farming civilization cannot defeat nomadic civilization. After all, nomadic people established their political power on horseback, and they are much stronger than the people of the Central Plains. Moreover, the nomads often hunted on the grasslands, and the cavalry had a large number and amazing fighting power. The Ming Dynasty would definitely suffer a big loss against these nomads.