First of all, the strength of Li Zicheng's soldiers is not strong, and it is purely accidental to capture the capital. When Li Zicheng attacked the capital, the border war was tight, most troops were guarding the border, and the number of troops resisting the siege of Li Zicheng was very small. When he attacked the city, many people saw that things were not good and surrendered to him. Many unnecessary wars were lost. The ruling emperor, because he listened to the treacherous court official's advice and believed in the strength of his own army, did not take Li Zicheng's siege seriously, and too lightly led to the success of the siege.

After the siege was successful, the soldiers of the Li Zicheng Army began to take credit for it, and it gradually got out of hand. Since Li Zicheng proclaimed himself emperor, his previous promises to farmers have not been fulfilled, and he has gradually lost popular support. However, because he proclaimed himself emperor, he began to live a luxurious life. Due to the lack of treasury reserves, he began to collect taxes, and the lieutenant often led troops to extort money from farmers or wealthy businessmen.

Because Li Zicheng indulged his subordinates, people had great opinions about the new emperor Li Zicheng. The support of the people had a great influence on the emperor. Losing popular support means losing the foundation of the country. Therefore, after Li Zicheng's defeat, there were no wealthy businessmen to support him and no one to protect him.

Finally, Li Zicheng's biggest mistake was to stifle his own strength. When his country was unsafe, he began to doubt his subordinates and feared that they would take the lead in Gao Zhen. So when I saw someone with high prestige, I was killed. Before the battle was even, he fired the strongest man in his army, which undoubtedly dispersed morale. At this time, the army lost the hearts of the people at home and abroad. Even if there are millions of soldiers, they can't fight for him anymore.