During Zhuge Liang's first Northern Expedition, due to Guo Huai's reasons, Liucheng's troops could not come to Jieting to support it, which led to the fall of Jieting. Zhuge Liang's fourth Northern Expedition went very smoothly. He won all the way, and robbed Wei Jun of grain and grass. Without food and grass, Wei Jun had no intention of fighting because of successive failures. Finally, Guo Huai appeased soldiers everywhere and searched for food and grass. In the end, Wei Jun's army didn't fight over grain and grass, which also undermined Zhuge Liang's strategy.
Guo Huai's greatest contribution was Zhuge Liang's last Northern Expedition. Zhuge Liang was old at that time and always remembered Liu Bei's entrustment. Zhuge Liang was exhausted by the long-term analysis of the war situation, and Guo Huai also knew that Zhuge Liang's body could not last forever in his last resistance during the Northern Expedition, so he fought a protracted war with Zhuge Liang. Zhuge Liang was too healthy in the long-term strategy, and the Northern Expeditionary Army was defeated after his death.
There are not many descriptions in Guo Huai's novels. Although he resisted Zhuge Liang's numerous northern expeditions, in fact, some failures of the northern expedition were also due to Zhuge Liang's internal reasons. Of course, Guo Huai also has his own abilities. However, Zhuge Liang is more powerful than Zhuge Liang's strategy. Guo Huai is also a small player, and he can grasp the stability of the situation better than others on some issues. Zhuge Liang's dream of the Northern Expedition never came true.