Why did Yang Guang and Li Shimin fail to levy Korea?

The reason for his disagreement is this. He said, "Now it is the personal expedition of the son of heaven. How can it be the same as the conquest of other generals? There must be no danger and no luck. At present, there are almost 1, prisoners in Jian 'an and Xincheng. If we attack Wugu City, they will all follow us, which is very dangerous. It's better to break Anshi first, then take Jian' an, and then drive on. This is a foolproof policy. " To put it bluntly, this is the personal expedition of the son of heaven, and safety should be the first. No matter what tactics are not used, as long as the safety of the son of heaven can be safely guaranteed, how can insurance come? How is this a war? It's a joke! It is against the art of war to have this mentality, and it has lost its strategy of fighting by surprise forever.

This is the emperor's personal expedition. You don't think for yourself, but ministers should think for you. It is not just a military issue, but more importantly, a political issue. This is the battle between the emperors, so as to ensure a complete solution. This greatly limits the talent of military generals, so that they can't do it according to the method they can win, but can only fight in an orderly way according to the most stupid method of the high command. This is too difficult, so you will see that those excellent generals have lost their dazzling brilliance and become mediocre.

Hu Sansheng noted here: "When Taizong decided to conquer the world, he mostly won the battle of Liaodong by surprise, trying to defeat the enemy by all means, so he was in vain." Agree with this statement. Sun Tzu's The Art of War also said: Soldiers are cunning. Once you lose your concealment and fight a war of attrition face to face-unless you have to, this nail is the key to the victory or defeat of the war and must be pulled out-it will be difficult to give full play to your advantages. Wang Fuzhi also made an analysis on this in Reading as a Mirror. He also thought that in this Anshi War, Li Shimin was once subject to Li Shiji and then to Changsun Wuji, so he lost a great opportunity to pacify Korea and delayed his time in the meaningless struggle for one city and one place. This is called going for the end, and there is no reason not to fail!

So, Tang Jun attacked the strongest city in Korea again and again. Anshi was well prepared to defend the city, with plenty of food and grass, and its soldiers were stronger than Ma Zhuang. Their garrison defense was very successful, and they constantly organized elite teams to attack downtown, turning passivity into initiative, which made Tang Jun unable to give full play to his advantages, which was a headache.

In desperation, Li Daozong, the king of Jiangxia, adopted the most stupid method, mobilized troops to build a dirt mountain in the southeast corner of Anshi City, which increased little by little and approached the city wall little by little. The garrison in Anshi also reinforced and raised the city wall by the same means to compete with it, and attacked the city six or seven times a day. Often, Tang Junyong's front foot smashed the watchtower on the wall of Anshi, and his back foot was repaired by Korean soldiers immediately. Tang Jun was very tired. Li Daozong was shot in the foot when he was directing the siege. Although Li Shimin personally gave him a needle, he was very helpless about the siege effect.

the same stupid way, building a mountain. It took Tang Jun two months and 5, man-hours to build a mound of earth around the clock, and finally a mound of earth was built, which was much higher than the city of An. This heaped-up mountain is only a few feet away from the wall of Anshi. Standing on the top of the mountain, you can see the situation in the city. Li Daozong sent Guo Yi (official name) Fu Fuai to the top of the mountain to guard against the enemy. Unfortunately, for Tang Jun, the best opportunity to break the city was missed.

One day, the side of the built earth mountain near Anshi City suddenly collapsed, and the heavy earthwork pressed against the wall of Anshi City, which even collapsed, exposing a big gap. This is the best chance to break into the city, but the general named Fu Fuai left his post privately, not on the dirt mountain, and the soldiers didn't know what to do. While hesitating to wait, hundreds of Korean warriors fought their way out of the gap, and even beat back Tang Jun and captured the heaped-up mountains, making this important fortification, which took Tang Jun two months to build, fall to the enemy. Korean soldiers quickly reinforced the heaped-up mountains, making them integrated with the city walls, and this heaped-up mountain became a powerful part of Anshi's defense, which was really a great irony for Tang Jun.

Li Shimin was furious and ordered the general to be killed. He launched a fierce attack on Tushan for three days in a row, but he could not attack it. Li Daozong barefoot confesses to Li Shimin, asking for punishment for his improper employment. Li Shimin said: "What you have committed is a capital crime; However, I think that Emperor Wu of the Han Dynasty killed Wang Hui, not as good as Qin Mugong's Meng Ming. Besides, you have contributed to the destruction of Gaimou and Liaodong. Therefore, you are not guilty. "

what kind of war is this? A city has been stormed for three months, from summer to winter, "grass is dry and water is frozen", horses can't eat forage, soldiers' light clothes can't resist the attack of winter, and most importantly, rations are running out. After the retreat, Li Shimin finally ordered the troops to return to China. Before returning home, he didn't forget to show off the prestige of the imperial army for the last time and his demeanor as the emperor of the Tang Dynasty. He pulled all the troops to Anshi at the gates and held a huge military parade. All the Korean soldiers in the city lay in ambush, leaving no trace. Only the duke of guarding city stood in Chengtou, thanking Li Shimin from a distance. Li Shimin praised his achievements in guarding the city, and gave him 1 silks, educating his subordinates to "serve the king with diligence" like the duke.