Yang Di, why did Emperor Taizong fight Goguryeo?

Emperor Wendi of Sui Dynasty, Emperor Yangdi of Sui Dynasty, Emperor Taizong of Tang Dynasty, and Tang Gaozong, the four emperors' daily life was to eat, sleep and play Koguryo, and these four emperors spared no effort to explore Koguryo.

As for why Goguryeo was beaten, we have to start with the land occupied by this country. If Koguryo honestly occupied the mountainous peninsula of the Yalu River where hundreds of birds were constipated, Sui and Tang Dynasties, far away in the west of the Central Plains, didn't even bother to fight with him seriously, let alone make an expedition.

However, the place where Koguryo went was not well developed, so he came to the best land outside the customs-Liaohe Plain, which is the central part of Liaoning Province today. It is the second largest plain in East Asia, second only to the North China Plain. During the Sui and Tang Dynasties, it was in the warm period of the earth, with high overall temperature and abundant rainfall.

Northeast China can also grow high-yield crops on a large scale. Developed agriculture can bring more food, so it can feed more people. With a rich labor force to develop handicrafts, we can use the rich mineral resources here to build advanced weapons and equipment.

Therefore, the regime that can take root in the northeast is one of the biggest hidden dangers of the Central Plains Dynasty. The key is that there is a natural mountain barrier here, probably just like the Guanzhong Plain, where Qin rises, which can be defended and attacked. If we give it a powerful regime and appropriate policies, then the achievements inherited by the empire are just around the corner.

If Goguryeo, such as the Sui and Tang Dynasties, develops gradually, and then the armored weapons made from northeast resources enter the grassland to obtain a large number of horses from nomadic people, then the Commissioner can compete with us for hegemony. It is not impossible for Confucius and Qu Yuan to become Koreans now.

Therefore, the occupation of the Northeast Plain means the entrance ticket for the Chinese Empire, so the vast and fertile Liaohe Plain, which is suitable for farming, is the inverse scale of the Central Plains Dynasty. As long as conditions permit, it will be suppressed and divided, and it will be miserable if it cannot be done in the Central Plains Dynasty.

For example, the later Khitan, Nuzhen and Manchu were all based in the northeast, and the Central Plains dynasty was too proud to fight, and some of them still entered the Central Plains.

So in 6 12 AD, Emperor Yang Di rolled up his trouser legs and began to work. However, this big boss of Sui was a little too modest to send1130,000 troops to fight all the way, sending troops on this scale.

Apart from increasing the logistical burden, it has no practical significance in the military. As a result, he was beaten in the face if he did not dominate, but he did it correctly. Li Shimin, the emperor Taizong, who was known as "an emperor through the ages" and "whoever beat him" in later generations, basically continued his policy.

Yang Di hit Goguryeo, and Emperor Taizong also hit Goguryeo, but he conquered Liaodong with his impatience, and Yang Di opened the Grand Canal, and Emperor Taizong also opened the Grand Canal.

The only difference is that Emperor Yang Di was in pain. If he doesn't make it, it's a waste of people and money. If Taizong succeeds, he will become a saint, but it also proves that Yang Di's grasp of the direction is correct.