Why was the powerful Cao Cao finally defeated by Liu Bei, who had just risen?

First of all, Cao Cao's fiasco in the Hanjiang War was the main reason for his final failure in the whole Hanzhong War. In this war, Liu Bei's commander in chief was Zhao Yun, and his generals were Huang Zhong, Zhang Yi and Zhang Zhu. Cao Jun is the commander of Cao Cao. In the twenty-four years of Jian 'an, Liu Beijun and Cao Cao competed for Hanzhong, forming a confrontation. Then Zhao Yun led an army to attack Cao Cao's grain and grass in Beishan, and then defeated Cao Cao with a trick. Cao Cao's army was greatly shocked. They trampled on each other and drowned in the Han River.

Although the Battle of Hanshui was only a part of the whole Hanzhong Campaign, it did not take place in the main battlefield of the Battle of Cao Liu. However, the war had a great influence on the whole situation. In this war, Cao Cao's army not only lost a lot of food and capital to fight against Liu Bei, but also caused many soldiers' casualties when retreating. This dealt a great blow to Cao Cao's morale. At the same time, Wang Ping, the general of Cao Wei, surrendered to Liu Bei. Cao Cao's army has been defeated by Liu Bei's army.

So less than two months after confronting Liu Bei, Cao Cao had no choice but to give up and quit Hanzhong. Secondly, Cao Cao's carelessness is also an important factor in his failure. Cao Cao relied on his many generals and soldiers, ignored the advice of his advisers, despised the enemy, and gave Liu Bei a chance, which resulted in a fiasco. Third, the outstanding performance of Liu Bei's generals such as Zhao Yun and Huang Zhong is also an important reason that affects the war situation. In the battle of Hanzhong, Zhao Yun, Huang Zhong and other famous Shu and Han generals paid attention to grasping the opportunity of the war, winning by raiders and breaking the battle.

In a word, the result of Hanzhong War was the result of many factors. Although Cao Cao was defeated in this battle and lost his general Xia, his main strength still exists. His strength has not been seriously damaged, and his comprehensive strength is still higher than that of Liu Bei. Liu Bei took this victory to occupy Hanzhong, consolidated his own strength and laid a solid foundation for the establishment of the Shu-Han regime.