The Spring and Autumn Period：serve Qin in the morning Chu in the evening 竊符救趙

During the Warring States period, the two great powers of Qin and Chu were at loggerheads, and some small states, for the sake of their own interests, suddenly turned to Qin, and suddenly came close to Chu, always using one of them as a friend to fight against the attack of the other great power. Qin, on the other hand, also used the tactic of fighting and pulling, sometimes drawing in this one to fight that one, and sometimes befriending that one to teach this one a lesson. The less powerful states, such as Zhao, Wei, Han, Song, etc., all threw themselves into the hands of Qin at one time, approached Chu at another time, and then harmonized with Qi at another time, without a stable policy, and the result was inevitably weakening and perishing.