Ma Su is a Confucian general in Shu Han, and he is talented and appreciated by Zhuge Liang. However, Ma Su read the art of war without asking for a solution, and even became arrogant and stubborn. Zhuge Liang knew this well, but one of the important reasons why he was sent to guard the kiosks was that Ma Su was "one of our own". There are three political groups in the Shu-Han Dynasty, which are secretly disunited. This situation was still under control when Liu Bei was alive, but Zhuge Liang tried his best to safeguard the interests of his Jingzhou Group after he came to power, while Yizhou Group headed by Yan Yan and others and Yizhou Indigenous Group headed by Huang Quan and others were excluded by Zhuge Liang, so Zhuge Liang reasoned that only Ma Su could use it. Of course, he knew that Ma Su was exaggerating, so he was also prepared to let Wang Ping follow Ma Su. But Zhuge Liang was wrong. Ma Su didn't listen to Wang Ping at all, which led to the defeat of Jieting, which was the first defeat of the Northern Expedition and the first defeat of Zhuge Liang in his life. This shows that people are not sages, Zhuge Liang is not a god, and he also has human weaknesses.