By the time Qin reached King Zhao of Qin (306-250 BC), he had actually begun a war to unify the nations, successively seizing large lands of Han, Zhao, Wei, Chu and other countries, and destroying a large number of armies in the eastern countries, amounting to one million, laying the foundation for Qin's unification of China. King Xiang of Qin Zhuang died in 247 BC, and Lü Buwei of Xiangguo made the thirteen-year-old prince the monarch of the country, that is, the prince of Qin. The power of the state was in the hands of Lü Buwei, and during the first few years of his reign, the Qin state continued to hold dozens of cities in the Zhao, Han, and Wei states. The eastern countries saw that the power of the Qin State was getting stronger and stronger, and the six countries would be "eaten" one by one, so the countries adopted a policy of cooperation and connivance, and united to jointly oppose the Qin State.
In the twenty-second year of King Chu Kaolie (241 BC), in addition to the Qi State, Han, Zhao, Wei, Yan, and Chu sent troops to join the camp of Hezong, and publicly elected the Chu State as the leader, and worshiped the Chu State Chun Shenjun Huang Xie as the general. He led the alliance of the five countries and slaughtered the Hangu Pass of the Qin State. Qin Xiangguo Lü Buwei sent five generals, Meng Tian, Wang Qian, Huan, Li Xin, and Nei Shi Teng, each with 50,000 troops, to meet the alliance of the five countries separately.
Wang Jian decided to use the strategy of capturing the thief to capture the king first, and first destroy the Chu army, and once the Chu army is defeated, the other ** teams will be defeated. Wang Jian secretly passed down an order to prepare the army for night battles, and use the night to launch a surprise attack to attack them unprepared. This news was carefully reported to Chun Shenjun by the Chu State traitors under Wang Qian. Chun Shenjun was shocked when he heard this, and he didn't care about notifying the other four ** teams, so he ordered the withdrawal of troops overnight. When the fourth ** team heard that the Chu army had fled, the army's heart was shaken and they had no intention of fighting. The five men and horses of the Qin State merged into one army and charged the four-nation alliance, and the four ** teams fled without a fight. In this way, the ostensibly powerful Five-Nation Alliance was thwarted by Wang Qian's strategy.