Actually, after listening to the argument between Guan Yu and Zhang Fei at the banquet, Sima Yi had already realized Zhu Geliang's empty city plan. He sent scouts to investigate and believed that there was no fraud in the city. However, he still chose to withdraw, not because he failed to see through the empty city plan.

Actually, Sima Yi's withdrawal was to protect his own and Wei's interests. If Sima Yi really captured and killed Zhu Geliang in this battle, the next person to die might be him, because the three generations of Cao's father and son were all on guard against Sima Yi. Moreover, in the later period of Cao Wei, there were not many talents that could be used, and they still needed to rely on Sima Yi to fight against Zhu Geliang. Therefore, Sima Yi could not take risks in this battle.

In addition, withdrawal can also achieve Wei's strategic goals. At that time, the war between Cao Wei and Dong Wu had entered a deadlock, and there were also some conflicts and unrest factors within Wei. If Sima Yi sacrificed in the Yi Ling battle, it would shake the morale of Cao Wei's army and affect the overall situation. Therefore, Sima Yi's withdrawal can ensure the stability of Wei and prepare for subsequent wars.

In conclusion, although Sima Yi saw through Zhu Geliang's empty city plan, he still chose to withdraw. This is a wise decision, and it is also the determination that he should have as a military strategist.

Sima Yi's strategy and talent were highly praised during the Three Kingdoms period. However, he was not without blunders. For example, in the Hefei battle, he was defeated by Zhou Yu's fire attack plan. And in Zhu Geliang's empty city plan, although he saw through the other party's strategy, he dared not take risks and chose to withdraw. Although this decision was criticized as "cowardice" by later generations, it was a steady and long-term consideration for Cao Wei. Because at that time, capturing and killing Zhu Geliang had certain significance, but for Cao Wei, it was more important to protect Sima Yi, this important general. If Sima Yi lost or sacrificed in this battle, Cao Wei would inevitably suffer a serious blow, which may even lead to its extinction. Therefore, Sima Yi's decision to withdraw was actually a wise strategic choice.

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