After Liu Bei's death, Zhuge Liang began to master the military and political power, and Shu Han lost Jingzhou. After the defeat of Yiling, the regime was crumbling. What kind of regime did Liu Bei hand over to Zhuge Liang? After Zhuge Liang came to power, he first formed an alliance with Sun Quan in the East during Liu Bei's national mourning and accumulated strength. In the spring of 225 A.D., he set out to conquer barbarians in the south, put down all rebellions in the autumn of that year, and moved back to Chengdu in June+February of 5438. In 228 AD, the Northern Expedition began. After the five northern expeditions, due to the weakness of Shu Han, the western line of Cao Wei was disrupted, and Xinmeile Co., Ltd. and Zhang He were beheaded, occupying Tianshui, Nan 'an and Anding counties. Sima Yi, who participated in the Lucheng War, feared Shu like a tiger and never dared to confront Zhuge Liang head-on.
Sima Yi's main achievements are: defeating Zhu Gejin in Wu Dong, defeating Mengda on the eighth day after marching in a hurry, resisting Zhuge Liang's Northern Expedition in the Western Front with a war of attrition, and leveling Liaodong. In the fourth Northern Expedition, Zhuge Liang, who fought directly between the two sides, was also called the Xialong War. In 23 1 year, Zhuge Liang went out to Qishan and Xialongcheng, and Zhuge Liang boldly went deep into Wei land and robbed Wei of wheat. He confronted Sima Yi, boldly divided his forces, lured the enemy deeper and defeated Sima Yi. According to "Han Jin Chun Qiu", the Han army won the first 3,000 ranks and Xuanjia 5,000. This sentence is also used in Zi Tong Zhi Jian. This battle was the first major confrontation between Zhuge Liang and Sima Yi. Sima Yi plays at home, and his strength is dominant. Zhuge Liang fought away from home and defeated Sima Yi with weak strength. It is clear at a glance who has higher military capabilities.
After this war, Sima Yi never dared to confront Zhuge Liang head-on, but delayed by avoiding fighting, and finally dragged Zhuge Liang to death. On military talent, Zhuge Liang completely defeated Sima Yi.