At that time, Guo Jia followed Cao Cao to fight Gongsun Du, but perhaps Guo Jia was in poor health and could not bear such bad terrain and weather. Maybe he's jealous of talent. Cao Cao felt sorry for Guo Jia's death soon after he fell ill, and sighed, just like losing his soul, feeling guilty and uncomfortable. "Guo Fengxiao is here, don't be alone!"
In the year of Guo Jia's death, Zhuge Liang, another big boss, came out of the mountain, but Zhuge Liang's plan was actually based in Jingzhou, and Jingzhou was basically powerless without Shu.
But later Sima Yi helped Guo Jia "avenge" Gongsun Yuan, and GongSunYuan really wanted to die. He knew that he was inferior to others, and he called himself emperor and rebelled.