Why did Emperor Yang Di's expedition to Koguryo fail miserably?

Yang Di Yang Guang, Emperor Yangdi of Sui Dynasty, was not only a tyrant, but also a scholar and literary youth. He wrote 30 volumes, covering all aspects. His cousin Li Shimin (Li Shimin's calligraphy, articles and poems are all good, and he personally wrote The Book of Jin and Wang Xizhi's Biography) thinks he is "ignorant". In addition, Emperor Yang Di once arrogantly invited his civilian boss to fight, saying that even if he chose the son of heaven through articles, he could do it himself. Emperor Yang Di did have foresight in political system (imperial examination system) and geopolitics, and the expedition to Koguryo was the best proof of his foresight. However, it is precisely because the talent of Emperor Yang Di is too high that he always thinks it is right to do what is happening in the world according to his instructions. Subordinates understand what they know, but do it if they don't, and flagrantly start the mobilization expedition mode of Sui Dynasty. The total number of registered permanent residence in Sui Dynasty was 8.9 million. He mobilized1133,800 people in one breath, and then turned millions of young adults into migrant workers (more than 600,000 civilian workers were recruited to transport food and hundreds of thousands of people transported military equipment). The mobilization ability of Sui Dynasty reached the limit of four households and one person. It took four years to mobilize and nearly one year to send troops to Liaodong. Yang Di arrived in Zhuo Jun on April 5, 6 1 1, and did not attack Liaodong until the second day of the first month of June12, and did not reach the west bank of Liaohe until March 41. Before the attack on Goguryeo, the water was made to be reconciled with it, and Duan Wenzhen, the minister of the Ministry of War, advised Yang Di to make a decision quickly, but Yang Di chose the bigger the scene, the better. The problem is that he mobilized millions of people. According to the records of the participating troops and neighboring countries, only 300,000 people reached the battlefield. Goguryeo believes that his enemy is 300,000 Sui troops, and Japan, which pays close attention to the Korean peninsula, has a similar view. Therefore, this large-scale expedition is actually meaningless. Sui Jun can use the field advantage of elite troops to quickly attack Koguryo, so as to make a quick decision. At the very least, it can repeatedly attack and destroy Koguryo's production preparation in a few years. On the contrary, this preparation for bankruptcy allowed Goguryeo to "package" and store the crops around the city for five consecutive years. Yang Di used so many troops for his own reasons, that is, he thought that the strategy of "attacking the heart is the best" was in line with Confucian classics. If a general asks about Emperor Yang Di, it is estimated that he will take out Xunzi's theory to defend himself, because Xunzi said that the teacher of benevolence and righteousness is the best, and he can kill the Qin Dynasty (the problem is that he is a copy of the Qin Dynasty). Yang Di repeatedly stressed that when the enemy surrendered, he should report to him and ask him for instructions on the marching route. In Liaodong battlefield, the number of Sui Jun and its field advantages were completely offset, and it could only be plunged into a brutal siege war, while Koguryo people lacked cannon fodder and food, and Sui Jun was extremely difficult to chew. What's more, due to the instructions of Emperor Yang Di, Koguryo people will take the initiative to "surrender" when they can't hold on, and "surrender" must be approved by Emperor Yang Di. There was no WeChat at that time. By the time Emperor Yang Di gave instructions, Koguryo people had already repaired the Yugoslav capital and continued to be timid. Emperor Yang Di emphasized that orders were forbidden, but he did poorly in battlefield discipline. Lai Hull led 40,000 Jianghuai water troops to land amphibious. After hitting Pyongyang, the military discipline was lax and was ambushed and defeated by Koguryo people. Yuwen Hu and 300,000 people of the Ninth Army were attacked by Koguryo's army when they were in Huashasui (now east of Pyongyang, North Korea). The whole army rushed to flee, and most of them were lost in the enemy's pursuit (a few were captured, became part of Koguryo's army, and even lived to Li Shimin for an expedition). Yang Di is a master of liberal arts, unlike his cousin Li Shimin, who is a military master. However, he is conceited and used the universal spirit of Confucianism to guide the war, which naturally led to a great defeat. This article is the original manuscript of Cold Weapon Research Institute and the signing author of the headline number of Cold Weapon Research Institute. Li, editor-in-chief and author of the original profile, is not allowed to reprint any official account of the media or WeChat without written authorization, and offenders will be investigated for legal responsibility.