As we all know, Zhuge Liang was a wise man recognized during the Three Kingdoms period, when he was still in the hut, there was his legend in the world, and since he came out of the mountain, he had written the legend by hand, and the Shu lord Liu Bei even commented on Zhuge Liang: There is Kong Ming in loneliness, and there is water in Juyu. However, despite Zhuge Liang's superior wisdom and exhaustive strategy, he still made a big mistake before his death, and it was precisely because of his wrong decision that he eventually killed a general who should not be killed and spared a villain who should be killed.
Since the deaths of Guan Yu, Zhang Fei and others, Shu Han has fallen into an embarrassing situation of not being able to catch up, and when Jiang Wei's Northern Expedition came, he even spread the ancient famous sentence that "there is no general in Shu, Liao hua is a pioneer". In fact, Shu Han originally had a fierce general, but he was crowned with the hat of "easy to react" in Zhuge Liang's dying instructions, if nothing else, only because he had a backbone in the back of his head. I believe that many people have guessed it, that person is Wei Yan, who is brave and fierce, but has a proud personality.
However, even if Wei Yan no longer had anyone in sight, he still had a sworn enemy, Yang Yi. The original text records: Yan was good at raising soldiers, brave and fierce, and high in temperament, and he avoided it at that time. Only Yang Yi did not pretend to extend, and extended to think that it was like water and fire. However, Yang Yi's talent in raising and calculating military food was unmatched by others, and Zhuge Liang both cherished Yang Yi's talents and admired Wei Yan's Xiao Yong, but he was never able to regulate the relationship between the two.
In 234, Zhuge Liang's illness worsened, and he secretly planned the retreat arrangements with Changshi Yangyi, Sima Feiyi, and the protector Jiang Wei. Zhuge Liang's meaning was obvious, the reason why he did not call Wei Yan to explain the aftermath was actually to exclude him from the inner circle, that is, he was ready to take the opportunity to get rid of Wei Yan. Judging from Wei Yan's biography, he first disobeyed orders and did not withdraw his troops, then burned the Pavilion Road to hinder the retreat of the army, and the evil people first sued Yang Yi for rebellion, and after being discovered by Dong Yun and Jiang Huan, he even wanted to lead his troops to fight a civil war.
After a series of brainless operations, Wei Yan successfully pushed himself to the opposite side of the entire Shu Han. However, Wei Yan never thought of surrendering to Cao Wei, and until he died, he just wanted to get rid of Yang Yi. In fact, Wei Yan's mind was no longer important, as long as he launched a civil war, it was an act of rebellion. However, what everyone did not expect was that Yang Yi, who had high hopes from Zhuge Liang, was late in life, and he actually said to Fei Yi: When the past person xiang died, if I raised an army to take the Wei clan, I would rather be so evil! It is irretrievable to regret.
As soon as Yang Yi's golden mouth opened, even the Heavenly King Lao Tzu could not protect him, and Wei Yan did not move his mind to surrender to Cao Wei, but you dared to move this kind of crooked brain, and now you are still regretting it, is this not "in the heart of the Han camp in Cao"? Compared with Yang Yi, Wei Yan's mistake was simply a small witch. To be fair, Yang Yi's act of killing Wei Yan was completely honorable, but the "heartfelt words" he said also proved his dissent. Zhuge Liang only saw Wei Yan's stubbornness, but did not see Yang Yi's two hearts, choosing Yang Yi and giving up Wei Yan, presumably the only mistake Zhuge Liang made in his life.