At the end of Sui Dynasty, Dou Jiande, known as the teacher of benevolence and righteousness, was finally defeated by Li Tang.

Dou Jiande, Wang and Li Yuan were the three strongest forces in the uprising army at the end of Sui Dynasty. The main reason for Dou Jiande's failure is that its military capability is inferior to that of Li Shimin. In terms of military command, Li Shimin is far-sighted, and his analysis of the battlefield situation is unparalleled. Li Shimin saw the weakness of Dou Jiande's army. Wang knew that he was no match, so he turned to Dou Jiande for help. Dou Jiande also knows that the lips are dead and the teeth are cold. Destroy the king, the next target must be Dou Jiande. When Dou Jiande got the king's help, he decided to help the king defeat.

Dou Jiande garrison is far away from Luoyang, and Dou Jiande is exhausted from the long-distance attack. Li Shimin attacked first and fought a small battle. After winning, he ended the battle and demoralized the enemy. Dou Jiande has a long supply line. Li Shimin robbed Dou Jiande of grain and grass several times, and Dou Jiande was a little overwhelmed. Dou Jiande's army was stuck, and the soldiers were homesick. Li Shimin seized the opportunity to attack accurately and defeated Dou Jiande.

Seeing that the reinforcements were defeated, the king could not control himself and surrendered. Both Wang and Dou Jiande became prisoners, but their endings were different. Wang was released and Dou Jiande was killed.

The reason why two people have different endings is mainly because they have different prestige among the people. The king's rule over people is full of complaints. Few people really believe him. As long as he is exiled to a remote place, he will lose his threat. Dou Jiande enjoys a good reputation among the people, and the local people completely obey the rule of Dou Jiande. If Dou Jiande is released, it may make a comeback and become a great resistance to the reunification of the Tang Dynasty. Later, Liu Heita recovered Hebei so quickly under the banner of Dou Jiande. ?