It is an eternal truth that those who win the hearts of the people are in the world and those who lose them are in the world. It is also for this reason that Dou Jiande's teacher of righteousness was defeated by Li Shimin. Because at first Wang supported Yang Dong as emperor, and when he became strong, Wang chose Jianguo as emperor. This suddenly triggered the contradiction between Wang and Dou Jiande, and the previous skirmishes gradually turned into wanton struggles and attacks. (cracks appear)

Later, Wang couldn't help it. He led his men directly to Dou Jiande's territory. In this way, the people of the two places fell into dire straits, and even sacrificed their lives to kill ordinary people as a bargaining chip for revenge. (lose confidence)

It was because of the constant struggle between the two men that they could not fight Li Shimin at that time. In addition, the people in their own country are very worried. They don't know when the war will come to them, so they start riots. (gradually failing)

Just when people needed to be appeased, Wang chose violent repression, which really made people completely chilling. Finally, after Li Shimin breached the city wall, the people of the whole city surrendered directly without any resistance, which led to the rout of Li Shimin Yishi, which was the best representative of losing people's hearts and the world.