Why not use Sima Yi in front of Cao Cao?

Cao Cao thought that Sima Yi was a wolf and would bite if he was raised. Cao Cao even dreamed that Sima Yi was a wolf. Distrust is the main reason why Cao Cao didn't use Sima Yi. He thought Sima Yi was unwilling to be a vassal. Facts have proved that Cao Cao's point of view is completely correct, except that Cao Cao did not kill Sima Yi.

Cao's distrust of him has to start from the beginning. Cao heard about Sima Yi's reputation and wanted him to work in the DPRK. Unexpectedly, Sima Yi pretended not to go, and Cao Cao began to suspect that he was pretending to be ill. Although Sima Yi pretended to be true, Cao Cao never really believed it. Cao Cao thinks that this person is not true and will not be loyal.

Extended data:

The battle between Sima Yi and Zhuge Liang has always attracted much attention. Zhuge Liang is recognized as a resourceful and determined person. Sima yi is not bad either, and has repeatedly made outstanding achievements. Therefore, the battle between them is a battle of wisdom and determination. The famous "empty city plan" in history is a classic duel between two people. There is a classical Chinese article "Kong Zhiming retreats Sima Yi" which records this wonderful confrontation.

The battle between Kong Ming and Sima Yi was not as fierce as Sima Yi, so this battle is also a famous case in history. It is enough to show Kong Ming's resourcefulness and accurate speculation on people's hearts. During the war, there were only about 2,000 people left on Kongming's side, while Sima Yi had150,000 people.

Such a disparity in strength contrast made others start to panic, and only Zhuge Liang deliberately arranged the battle. He asked the sergeant to dress up as the people to clean the streets, told the rest of the people not to make any noise without authorization, and opened all the gates to meet Sima Yi. At the same time, he asked two children to take a piano to the tower to burn incense and play the piano.

When Sima Yi led his troops to the rostrum, he saw Kongming sitting on the rostrum playing the piano, with a child on each side. However, the city gate is wide open, and there are no soldiers in the city, only people who are leisurely cleaning the streets.

Sima Yi became suspicious and ordered the withdrawal. Son Si Mazhao asked why, and Sima Yi replied that it was because it didn't conform to Kong Ming's cautious character at ordinary times, and there must be fraud in the city, so he ordered the withdrawal. Therefore, Kong Mingcai was able to win this war.

The so-called know yourself and know yourself. This is the truth that military strategists have always believed in. However, tactics are tricky, and no one can say for sure what kind of enemy he is facing. Sometimes it is because you believe too much in your understanding and judgment of the enemy that the war will fail. It is precisely because of this that Kong Mingcai was able to defeat Sima Yi.

Baidu Encyclopedia-Sima Yi