It is precisely because of the melee between the three countries that their military equipment is very strict. As long as the Han people attach importance to military equipment and are not corrupted by corrupt scholars, nomadic cavalry is scum in front of the infantry in the Central Plains.
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Since the Song and Ming Dynasties, when Confucianism flourished, died from foreign enemies, China people were generally afraid of nomadic cavalry.
In the eyes of military historians, cavalry is nothing more than a mechanical advantage. In the Han and Tang Dynasties, when Confucianism was not prosperous, the Han infantry, who were brave and good at fighting, were never afraid of nomadic cavalry. As long as they are organized, disciplined and the commanders are not brain-dead, Han infantry can easily defeat nomadic cavalry five or even ten times.
On the one hand, Confucianism does not understand organization, on the other hand, it does not pay attention to discipline. The Ming dynasty, where the civilian led the army, was even more stupid in commanding the civilian, so it only lost ground when facing the nomadic people.
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During the Three Kingdoms and Wei Shuwu wars, the army must be organized, disciplined and trained. In the face of such a Han army, foreigners are vulnerable, not to mention the invasion and annexation.
Another similar example is the Spring and Autumn Period and the Warring States Period.
During the Spring and Autumn Period, the governors of the Central Plains had just been blocked, and the governors under the control of the Western Zhou Dynasty lacked fighting capacity, and the Central Plains was barbarian everywhere. Qi Henggong United with nine princes, respected the king to harass foreigners, led the Chinese vassal states to gradually exterminate and assimilate barbarians, and finally let the Central Plains not see a barbarian.
During the Warring States Period, the governors who destroyed the barbarians in the Central Plains went south and north in succession, crusaded against the barbarians around them and expanded their territory-the nomadic people in the north.
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There are similar examples abroad.
During the Little Ice Age, Europe also faced successive invasions from Scandinavia and Turkey, but these invasions were all defeated by Poland, a weak chicken among European powers.
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So a unified dynasty may not be able to effectively resist foreign enemies.
The divided princes may not be able to effectively resist foreign enemies.
Keys. Keys.
It is not whether it is unified, but whether it is.
1 Whether it is well armed and whether the military system is sound.
Has a unified value system been formed to jointly resist foreign enemies?
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Key point 2, very important.
The secondary reason why the Spring and Autumn Period and the Warring States Period were able to wipe out foreign enemies was that Guan Zhong's values of respecting the king and resisting foreign countries were widely recognized by the governors. Although the princes scuffled, they would not collude with foreigners to slaughter their compatriots (on the contrary, Zhou Pingwang did this to his father).
A secondary reason why foreign enemies in the Three Kingdoms could not invade was that the values of contempt and hatred for foreign enemies formed when the Han Dynasty was strong had not disappeared, so no vassal dared to take refuge in foreign enemies.