This is because there were a large number of conference semifinals in the army of the Tang Dynasty, and Emperor Taizong was also called Tiankhan in the Tang Dynasty. The Tang Dynasty was also an era of great cultural integration, so the conference semifinals were also in Tang Jun at that time. Later, with the strength of ethnic minorities, they already know how to build their own country, so naturally they don't need to rely on the Han people. Coupled with the later dynasties, because of the influence of Confucianism, they did not attach importance to the construction of the army. Therefore, in the face of the attack of powerful foreign cavalry, nature is helpless.

First, the Tang Dynasty was dominated by generals of conference semifinals.

Because of the cultural integration at that time, and the rulers also paid more attention to friendly exchanges with various races. So the conference semifinals can also stand on Tang Jun's side. For example, the Anshi Rebellion is a typical example. And by the end of the Tang Dynasty, the shaky army of the Tang Dynasty, that is, the army of the Arc People, was supported. In fact, since the Southern and Northern Dynasties, the fighting capacity of the Han people has generally declined. After this melee, all kinds of people in the Tang army have it.

Second, the weakness of the Han people has no innate strength.

Like those nomadic people, they were trained at home from an early age and knew how to ride horses and shoot arrows from an early age. Their main fighting capacity is cavalry, which can not only directly wash away the opposing army in the war, but also carry out long-range attacks. Take advantage of fast speed to outflank the enemy directly, and even if you fail, you have a great chance to escape. And with the blessing of various technologies, these cavalry with strong advantages have far exceeded the combat capability of the Han army.

Third, the cavalry strategy is changeable, and the Han people are unable to cope.

Moreover, the cavalry is very fast, and it is difficult for the general to quickly judge whether to attack from which direction. Then we must send many officers and men to defend at all times, which is not only inefficient, but also has a great burden on armaments. And by learning cultural knowledge, ethnic minorities also know how to use military technology to develop and strengthen cavalry. Even they have learned how to rule the Han people and have the ambition to establish political power. Therefore, in the face of this kind of opponent, if the Han people decline, they are likely to be destroyed.