One.
At the end of the Eastern Han Dynasty, Cao Cao became the most powerful prince with his outstanding talents, and his command was full of talents. Among the generals, in addition to Wuziliang General Ban, Xu Huang, Zhang He, Zhang Liao, and Le Jin, there are also Xiahou Yuan, Xiahou Xuan, Cao Zhen, Cao Ren, Cao Xiu and other Cao Wei clan generals. In terms of Wenchen strategists, there are many talents such as Sima Yi, Guo Jia, Xun Yu, Xun You, Cheng Yu, Jia Xu, Chen Qun and so on. However, among them, Xue Yi is unknown and little known.
Two. Xue Yi, whose name is Xiaowei, was born in Yanzhou East County (now Liaocheng City, Shandong). Xue Yi did not have an independent biography in Chen Shou's "Chronicles of the Three Kingdoms", and his life is only scattered in various articles and materials cited by Pei Songzhi. In 192 AD, Cao Cao captured Yanzhou, and Xue Yi became one of Cao Cao's talents.
In 194 AD, Xue Yi was appointed to Yanzhou. In the context of his father Cao Song being killed by Mu Taoqian of Xuzhou, Cao Cao personally led an army to attack Xuzhou. In the face of the betrayal of Chen Gong and Zhang Miao, Xue Yi assisted Cheng Yu, Xun Yu and others to hold the city of Yanzhou. This perseverance laid a solid foundation for Cao Cao to successfully repel Lü Bu and recapture Yanzhou.
Three. 
In 196 AD, Xue Yi was appointed as the Taishou of Mount Tai at the age of 22. This appointment made him famous as soon as possible, and he became a relative and friend of Dongjun Gongcao Chen Jiao. Chen Jiao later became the third duke of Cao Wei and had a prominent position. Xue Yi performed well in Cao Cao's western expedition against Ma Chao and the pacification of Jizhou, and was appointed as the head of Jizhou, Shi Hezhong, and became the representative of the good officials of the world.
Four. 
In 200 AD, Cao Cao and Yuan Shao broke out the Battle of Guandu, and in order to fight against the Yuan family, Cao Cao appointed Xue Yi as the pastor of Jizhou. In the process of Cao Cao's seizure of Yuan Shao's territory, Xue Yi held important positions such as Jizhou Taishou monk Shangshu Ling, and was gradually valued by Cao Cao. After Cao Cao established the Wei state, Xue Yi held important positions such as the Taishou of Wei County, and became an important and trusted advisor under Cao Cao.
Five. 
In 214 AD, Liu Bei captured Yizhou, and Cao Cao, in order to resist the expansion of Liu Bei's power, personally led an army to attack Zhang Lu. Xue Yi was appointed as a protector to assist generals such as Zhang Liao, Li Dian, and Le Jin in defending Hefei. In the Battle of Xiaoyaojin, Xue Yi, as a strategist, successfully assisted Zhang Liao and other generals to repel the Eastern Wu army, and established remarkable military achievements.
Six. After 233 AD, Xue Yi was named Shangshu, and he agreed with Sima Yi, Liu Fang and others to Cao Rong's plan to change Zhengshuo. However, in the subsequent historical records, Xue Yi's figure gradually disappeared, becoming a historical mystery of his whereabouts.
As a strategist under Cao Cao, Xue Yi was little known, but he showed outstanding intelligence and loyalty in all battles. He silently dedicated himself to Cao Cao and made indelible contributions to the rise and stability of the Wei State. However, in the long course of history, Xue Yi's brilliance was often overshadowed by more vivid heroes, becoming the hidden star of that era.
Xue Yi, as Cao Cao's advisor, although little known, has shown remarkable intelligence and loyalty in the description above. In the Battle of Yanzhou, he defended Yanzhou together with other strategists, laying a solid foundation for Cao Cao to successfully repel Lü Bu and recapture Yanzhou. This fully shows Xue Yi's side of not being afraid of adversity and being loyal to his duties. His contributions laid a solid foundation for Cao Cao's career.
The reason why Xue Yi is little known may be because of his humility and low profile. It is mentioned in the article that Xue Yi was only 22 years old when he was appointed by Cao Cao as Taishan Tai Punctuality, which showed his young and promising side. However, instead of being frivolous and arrogant because of his youth, he proved his talent with practical actions. As a young man, he performed well, which was a rare feat at the time. This may be one of the reasons why Xue Yi has been ignored by history, because he is more inclined to quietly contribute to the cause of the country and Cao Cao than to publicize himself.
Cao Cao's emphasis on Xue Yi is also reflected in the text. At the critical moment, Xue Yi was appointed as the head of Jizhou, Shi Hezhong, and became the representative of the good officials of the world. Cao Cao's trust and reuse of him enabled him to show outstanding talents in both military and government affairs. This is also one of the reasons why Xue Yi gradually emerged and became Cao Cao's right-hand man.
The Battle of Xiaoyaojin was one of Xue Yi's important military exploits for Cao Cao. As a protector, he assisted Zhang Liao and other generals in successfully repelling the Eastern Wu army, and made great contributions to Cao Cao's victory in the war. This battle shows Xue Yi's great talent in strategy and tactics, as well as his calmness and decisiveness in times of crisis.
However, although there are relatively few records of Xue Yi in history, his loyalty, intelligence, and dedication to the country have deeply influenced future generations. In that troubled era and the era of heroes, Xue Yi may not be so amazing, but it is such a low-key and outstanding strategist who contributed his own strength to Cao Cao's cause and made great contributions to the rise of Wei.
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