In 208 AD, Liu Bei and Sun Quan joined forces to attack Cao Cao, and defeated Cao Cao's army in Chibi area of the Yangtze River, laying a famous battle for the three countries to stand against each other and defeat the strong with the weak. Battle of Red Cliffs's failure made Cao Cao lose the possibility of unifying the whole country in a short time, and the prelude to the tripartite confrontation between the three countries was thus opened. In this campaign, Cao Jun's army participated in the war with more than 200,000 troops, and the combined forces of Sun Quan and Liu Bei were 50,000, which was even more different in strength, and finally ended in the victory of the combined forces.
The battle of Yiling, from 22 1 year to 222/year, was the last of the "three major battles" of the Three Kingdoms. Three months after Liu Bei proclaimed himself emperor, he thought Guan Yu would retaliate and sent troops to the east to levy Sun Quan. After Sun Quan knew that Liu Bei was going to attack himself, he sent a special envoy to ask for reconciliation, and Liu Bei refused to reconcile. In this campaign, Liu Bei's troops were almost wiped out, and tens of thousands of people were killed. According to Fu Zi's records, Wu Jun wiped out more than 80,000 Shu-Han troops, but only Liu Bei survived. The fiasco of Yiling is another great loss of Shu Han after Guan Yu lost Jingzhou. In the 40 years after the Battle of Yiling, the confrontation between the three countries was as stable as Mount Tai, while the territory between the three countries remained basically unchanged.
The Battle of Feishui was a famous battle in the Eastern Jin Dynasty. At that time, the society was in a turbulent state of disintegration, and the Eastern Jin Dynasty and the former Qin Dynasty were at war. Unexpectedly, the Eastern Jin Dynasty with only 80,000 troops actually defeated the former Qin Dynasty with 800,000 troops. After this campaign, the former Qin gradually declined and perished.