obviously saw through the empty city plan, so why did Sima Yi withdraw his troops?

Because Sima Yi was cautious, he was not very sure whether this was an empty city plan, so he could only withdraw his troops first.

Because if Zhuge Liang dies, Sima Yi will have no use value, and the Wei Emperor Cao Rui will soon deprive him of his military power, and he may also be killed, so even if he sees through the empty city plan, he can only withdraw his troops to protect himself.

At that time, it was also necessary for Zhuge Liang of Shu to contain Wei, otherwise Zhuge Liang would be useless if he hung up Sima Yi, and naturally his life would not be long.

In order to protect himself, Sima Yi knew that his usefulness was to help Cao Wei resist Zhuge Liang, and as soon as Zhuge Liang died, he would be worthless.

Although Sima Yi saw through the empty city plan, he still chose to withdraw his troops just in case.

Lao Tzu once said: Misfortune and blessing rely on; Blessings and misfortunes lurk! Sometimes doing a thing and succeeding looks like a blessing, but you don't know that the blessing will come after the disaster.

For example, Sima Yi saw through Zhuge Liang's empty city plan, and if he waved his army to attack the city, Zhuge Liang would definitely die. As soon as Zhuge Liang died, then the Wei army would inevitably take advantage of the situation to go south to destroy Shu, and as soon as Shu destroyed Wu, it would also be destroyed. The two great rivals of Wei were destroyed by Sima Yi, so what use did Sima Yi have?

has no use of force, but is in a high position and holds military power, then Sima Yi should go underground to accompany Zhuge Liang.

Sima Yi led an army of 150,000 to besiege Xicheng, and Zhuge Liang only had 2,500 soldiers in the city. After surrounding him for ten days, Zhuge Liang's strategy naturally failed, Zhuge Liang's first Northern Expedition will come to an end forever, and the next six Northern Expeditions will no longer exist. Sima Yi knew that with the existence of Zhuge Liang, he would be able to reach the pinnacle of power step by step in the Wei State; If Zhuge Liang falls prematurely, then Sima Yi's path to power will also be interrupted.

Therefore, after Sima Yi listened to Zhuge Liang's "Mountains and Flowing Water" song, he decisively led the troops to retreat and let Zhuge Liang retreat to Hanzhong safely.

Everyone in the world thinks that Zhuge Liang's empty city plan has concealed Sima Yi, but they don't know that Sima Yi deliberately let Zhuge Liang go, and letting Zhuge Liang have a way to live is to give himself a way to live. Sima Yi's second son, Sima Zhao, objected to the empty city plan and asked him to lead his troops to attack and test it first. Sima Yi decisively rejected the request of the second son, he said:

Liang was cautious in his life and never took risks. Now the gates of the city are opened, and there will be an ambush. If our soldiers advance, they will also be in their plans.

How do you know? It is advisable to retreat quickly. Sima Yi not only rejected Sima Zhao's tentative attack, but also immediately ordered the troops to retreat, very cooperative with Zhuge Liang's arrangement.

It can be seen that Sima Yi has long seen through the empty city plan, and when he listened to Zhuge Liang's music, he thought a lot and far, and he could only cooperate with Zhuge Liang to perform an empty city plan for today's plan, and also prevent his subordinates from destroying the empty city plan.

Of course, Zhuge Liang's empty city plan not only opened the city gate and played the piano on the city tower, but also arranged two ambush soldiers, performed the empty city plan seamlessly, and also gave Sima Yi the steps down. Zhuge Liang arranged for Zhang Bao and Guan Xing to lead 3,000 soldiers each to attack Sima Yi on the road. When Zhang Bao attacked Sima Yi, Sima Yi said to the generals:

If I don't leave, I will fall into Zhuge Liang's plan. When Guan Xing attacked for the second time, Sima Yi directly led the army back from the small road to the street pavilion. After the empty city plan was revealed, Sima Yi pretended to regret it, and looked up to the sky and sighed

I'm not as good as Kong Ming! If Sima Yi is really inferior to Kong Ming, why did Kong Ming return from his seven Northern Expeditions in vain, and was finally consumed to death by Sima Yi?

At that time, no one in Wei except Sima Yi was Zhuge Liang's opponent, and Sima Yi knew that the empty city plan was fake, and if he attacked and killed Zhuge Liang, he would not be far from death. If Zhuge Liang didn't die, Cao Rui wouldn't dare to move Sima Yi.

Under the historical circumstances at that time, it was the most correct decision to withdraw the army, if Sima Yi attacked this city and killed Zhuge Liang, Sima Yi would not have made great progress in the later period, and would be suspicious of the monarch of Wei.

The main thing is their own internal problems, the merit is high, he understands the truth of rabbit death and dog cooking, after getting rid of Zhuge Liang, he is likely to lose his own value and will be tolerated by the Cao family.

Because Zhuge Liang still has use value, if Sima Yi destroys Zhuge Liang, Cao Cao will no longer reuse Sima Yi. Because Sima Yi at that time had no use value for Cao Cao.

We all know that Zhuge Liang did three things in his life that he regretted, that is, he believed one person wrongly, used one person wrongly, and killed one person by mistake. At that time, it was because Zhuge Liang misused Ma Jian that Shu Han lost the military stronghold Street Pavilion. That's why Zhuge Liang, who almost didn't use dangerous tricks in his life, took risks and made an empty move.

But didn't Sima Yi see through Zhuge Liang's empty city plan? Of course not, Sima Yi has obviously seen through Zhuge Liang's empty city plan, why did he withdraw his troops?

First, Shu Han's qi is coming to an end.

At that time, after Liu Bei died, he entrusted the entire Shu Kingdom and Adou to Zhuge Liang, and instructed him to assist Adou well. But as we all know, it is Liu Adou who can't be supported, although Zhuge Liang has superior intelligence, but he has no choice but to assist such an unsuccessful monarch. At this time, if the empty city plan fails again, then the qi of Shu will come to an end.

Second, the Cao clan took serious precautions against Sima Yi.

I have to admit that Sima Yi is a very talented person, so he has been recognized by the Cao clan, but the Cao clan does not fully trust Sima Yi, they are in a state of half-use and half-defense against Sima Yi, and their precautions against him are extremely serious. In other words, Sima Yi is now just a temporary tool in their hands.

Third, the Shu Han Dynasty was shattered, and the days when Sima Yi was in charge of military power would also come to an end.

In fact, Sima Yi, as a smart person, knew that the reason why the Cao clan used him was just an expedient measure, just to use him against Zhuge Liang of Shu Han. Once Zhuge Liang is eliminated and Shu Han dies out, then the Cao clan will turn their heads against themselves, and at that time he will be in a passive situation, in a dilemma.

If Sima Yi entered the city and captured Zhuge Liang, then Wei would not need Sima Yi, because of his high merits, he might be dismissed or killed, so Sima Yi withdrew for personal gain.

Because he was afraid that the other party was really an empty plan, in which case he would suffer a lot of losses, so he chose to withdraw his troops.

Because Sima Yi knew that when he broke through the Shu Kingdom, that is, when he unloaded his armor and returned to the field, in order to continue to control the army, he cooperated with Zhuge Liang to play this empty city plan.

Because Sima Yi didn't want to kill his only competitor so quickly, if he killed Zhuge Liang in advance, he would feel lonely.

Sima Yi had to keep Zhuge Liang to give Cao Cao a reason not to kill himself, otherwise he would have killed Zhuge Liang early, and Cao Cao would not have kept him.

For self-preservation. Once Zhuge Liang is captured or killed, Cao Wei's regime will be very stable, and Sima Yi will no longer be needed.

Because only Sima Yi is Zhuge Liang's opponent, if Sima Yi kills Zhuge Liang, then Sima Yi will have no effect, and only Zhuge Liang is still alive can ensure Sima Yi's safety.

Because Sima Yi's personality is very cautious, he is afraid that Zhuge Liang will have a back hand.