In our minds, Zhuge Liang has always been a representative word of wisdom, he surprised the world with a longzhong confrontation, and helped Liu Bei establish the Shu Kingdom, which can be described as a great example as a courtier.
However, no one is perfect. After all, Zhuge Liang is still a mortal who will make mistakes. It was these two mistakes that made the Shu kingdom suffer a lot.
What did Zhuge Liang do after he seized the military and political power of the Shu Han Dynasty? He did a lot, but if it was against the State of Wei. It is precisely because of the six out of Qishan that Zhuge Liang's personal image has been enhanced. But if you think about it carefully, wasn't it Zhuge Liang's several Northern Expeditions that caused shu Han's yuan qi to be seriously injured?
Zhuge Liang's resourcefulness is impeccable, but he does not have a good eye for people. Before Liu Bei died, he specifically told Zhuge Liang that Ma Mo could not be used. However, Zhuge Liang did not listen to him. The first Northern Expedition, because of the important position of ma Mo, lost the street kiosk, and finally had to return home in sorrow.
In addition to misusing the horse, he also released a man he should have killed in his lifetime. In fact, this person is also a villain in the eyes of the world! Even Sun Quan, the lord of Wu, said, "Yang Yi and Wei Yan are also small people!" Of course, to say that Wei Yan is a villain, many people may be unfair to him, but Yang Yi is indeed a real villain. Zhuge Liang had discovered this before his death, but he did not take any measures against Yang Yi.
Although Wei Yan was not killed by Zhuge Liang himself, seriously speaking, he and Wei Yan were killed inextricably linked.
When Zhuge Liang foresaw that he was going to die, Wei Yan's life had come to an end, because Zhuge Liang did not allow Wei Yan to surpass himself.
Zhuge Liang had always feared military generals, but in the late Shu Han Dynasty, except for Wei Yan, there was no general who could defend one side.
However, Zhuge Liang has always been dissatisfied with him. He thought that Wei Yan would rebel in the future, so he used Yang Yi to restrain Wei Yan at every turn. But Zhuge Liang is indeed a bit outrageous in terms of looking at people. There is no record of Wei Yan's rebellion in the history books. He eventually launched an army because he was dissatisfied with Yang Yi, not because he rebelled against Shu Han.
However, Wei Yan was eventually killed, and died at the hands of his own people. After that, the Shu Han had already declined. When Sima Zhao, the chancellor of the State of Wei, sent Zhong Hui, Deng Ai, and Zhuge Xu to attack Shu Han, and Shu Han was only supported by Jiang Wei. In the end, Liu Chan surrendered, and Shu Han was destroyed.
If Zhuge Liang could have considered it carefully at that time, then the outcome of history may be completely different.