During the Three Kingdoms period, Cao Cao led an army of 200,000 people to assemble in the Chencang area and decided to attack the Hanzhong region! The first to fight was the Hanzhong general Wang Doumao, who used a small plan to eliminate it, and then killed all the way into Yangping Pass and directly attacked it, and the next day Zhang Lu surrendered to Cao Cao and showed weakness, from then on Cao Cao took all of Hanzhong and sealed his throat in a battle!

After conquering the Hanzhong region, many of Cao Cao's generals persuaded liu bei to take advantage of the victory to pursue Liu Bei in the south, but Cao Cao said: I understand your feelings, but now is not the time. The crowd frowned and didn't dare to ask more!
Everyone may also have such a question, why did Cao Cao not go south to attack Liu Bei? Don't you dare, or don't want to? Obviously not, Cao Cao's life was vigorous and frank, and there was nothing he did not dare to do, probably because of the following reasons that Made Cao Cao stand still first.
First, army stamina! No matter what kind of war is needed after the end of the rest, after the attack on the Hanzhong region, the army's physical strength is definitely not as good as the beginning, it is necessary to make team adjustments, directly go south to attack Liu Bei, it will definitely reduce the combat ability due to the lack of physical strength of the army, which will seriously lead to the failure of the siege, and at that time the previous efforts will be all in vain, so recuperating is the best choice!
Second, the problem of grain and grass! Cao Cao's 200,000 troops set out from the Guanzhong area, after capturing Hanzhong, they would need a lot of grain and grass, and the weather at that time was also very bad, and the grain transportation process was slow, so it would be due to insufficient grain and grass, the army would become scarce, and lose the basis for continuous combat, so Cao Cao did not dare to attack from the south.
Third, the internal and external situation! Cao Cao was about to be promoted to a managerial post, but there were Hanzhong relatives in the imperial court, who had been harassing Cao Cao's rear, Cao Cao could not move around, and now as long as he could stabilize the situation, Cao Cao could be steadily promoted to a managerial post, and separating from their palms was something that Cao Cao had to do! On the other hand, Cao Cao and Sun Quan often had wars, once Cao Cao decided to attack Liu Bei, it would be a long contest, Sun Quan was likely to attack Cao Cao's old lair, Cao Cao must be seriously injured, and lost his hand in the city, and finally became nothing, so stopping in time is the best situation for Cao Cao at the moment!
Fourth, the location! If Cao Cao attacked Liu Bei from the south, the road would be very difficult at that time, and the road would be very tortuous, plus there would be a lot of Yanmen Pass and Tong Pass in the road, all of which were easy to defend and difficult to attack, and once Liu Bei ambushed Cao Cao here, he would definitely lose the north and return, and even the whole army would be destroyed!
Therefore, according to the above points, attacking Liu Bei from the south is by no means simple! This was a long battle, coupled with the rough roads, dangerous passes, insufficient grain and grass, slow transportation process, and a series of other problems, and there were huge unknown factors behind him and Sun Quan's plot, which finally made Cao Cao choose to stay still and did not take advantage of the victory to pursue!