Although Liu Bei was relatively depressed in his early years, he still had no soldiers and no territory after working hard for many years, and could only live under the door of others. It can be said that the princes of the Three Kingdoms with some names, basically Liu Bei more or less attached to them. But Liu Bei has never given up the ideal in his heart, no matter how much suffering he encounters, he can calmly face starting from scratch. It was really in response to the saying that "those who have lofty ideals can succeed", Liu Bei's spirit of not accepting defeat, and his career finally ushered in a huge turnaround when he was in his forties.
With the joining of Zhuge Liang and many other talents, Liu Bei's strength gradually became stronger, and he began to have his own soldiers and horses and territory. Not only did it occupy Jingzhou, but it also captured Yizhou shortly after. It basically realized the strategy set by Longzhong in that year, and took a major step toward advancing into the Central Plains and reviving the Han Dynasty. In the ensuing Battle of Hanzhong, Liu Bei's victory further strengthened the strength of Shu Han, which was a strategic place in the west with steep terrain and abundant resources, and had always been a place where soldiers and families fought, and was still a very important place during the Three Kingdoms period.
Therefore, the competition between Cao Cao and Liu Bei for Hanzhong was very fierce, which was related to the division of the whole situation. The end result was that the weaker Liu Bei defeated Cao Cao and took Hanzhong. After that, Liu Bei became king of Hanzhong and sent Wei Yanzhen to guard Hanzhong, and with the natural danger of Qinling, Cao Cao could no longer use troops against Liu Bei. At this time, Liu Bei already had Yizhou, Yizhou, and Hanzhong, and his strength was the most powerful time in his life, and it was also the most prosperous period of Shu Han, and it can be said that he had fully met the conditions for advancing into the Central Plains.
After having Hanzhong, Liu Beijin could attack and retreat, which greatly strengthened the strength of Shu Han, and at this time, wu, Wei, and Shu did not dare to use troops easily, and eventually formed a three-legged situation.
For Cao Cao, the defeat in Hanzhong was tantamount to losing the possibility of invading the south. Cao Cao's original plan was to take Yizhou through Hanzhong, and then move his army south to collect Sun Quan, and then complete the unification. But after losing Hanzhong, Cao Cao had no possibility of realizing his plan. If Cao Cao wanted to retake Hanzhong, he had to cross the mountains and mountains, and even if the Xingshi mobilized the people to reach Hanzhong reluctantly, he still had to face the Shu army that was waiting for work. At this time, the Cao Army was probably already sleepy and lacking, and where was the opponent of the Shu Army, it could be said that the odds of victory were very low. Therefore, Liu Bei's victory in Hanzhong completely shattered Cao Cao's ideal of unifying the south.
If liu bei follows this trend, defends Yizhou, consolidates Hanzhong, strengthens Jingzhou, and then develops and grows step by step, it is very likely that he will successfully advance into the Central Plains and revive the world of the Han Dynasty. It was only a pity that Guan Yu lost the important land of Jingzhou, and what was even more fatal was that Liu Bei, who was bent on going his own way, played a bad hand himself, and was actually defeated in the Battle of Yiling, almost losing all of Shu Han's family foundation.
As a result, the great future of Shu Han was destroyed one after another, and the comprehensive strength of Shu Han plummeted, completely losing the possibility of advancing into the Central Plains, and could only take a corner of peace, stick to Yizhou, and the hope of reviving the Han Dynasty was shattered.