In 228 BC, the Qin army captured Handan and captured the king of Zhao. Zhao was destroyed. After occupying Handan, they met the Yishui River and directly threatened the Yan State. At this time, Yan's courtiers were panic-stricken and divided into two factions, namely the peace faction and the war faction. King Dan of Yan, who had just escaped from Qin, did not want to negotiate for peace, nor did he want to join forces with other princes to attack Qin. He firmly believed in the principle of catching the thief first and wanted to send someone to assassinate the King of Qin. So Prince Dan found Jing Ke, an assassin with thousands of years of history. Prince Dan asked Jing Ke to use a map to present the most fertile Dukang region of Yan to the King of Qin. Jing Ke wanted Fan Yuqi's head to look like Prince Dan. Who is this fan? General Xi was defeated by Zhao and fled to Yan. Fan saw that the King of Hell had no way out, so he had no choice but to sacrifice his life and take his head.

Everything is ready. Jing Ke took the map and Fan's head with him, leaving behind the famous saying "The wind is rustling, the cold is cold, and a strong man never returns", and then he took Qin Wuyang and set off for Qin. Who knew that when Qin walked into the court hall, Qin Wuyang was so frightened that his face was livid. During the map presentation stage, Jing Ke slowly opened the map, revealing the dagger at the end of map development, and his glove fell off the dagger. Jing Ke picked up a dagger and stabbed King Qin. Then King Qin came over and walked around the pillar. Then Jing Ke and Qin Wuyang were hacked to death by the soldiers who came here.

The assassination failed and Yan became a fish with a nail on it. The King of Qin became angry and sent Wang Jian and Xin Sheng to lead troops to attack Yan. This time, he only defeated the Yan army west of Yishui River and did not continue the march. And King Qin wanted to unify China, so of course he couldn't let King Yama go for so long. So in 226 BC, Zeng Bing continued to attack Yan. Needless to say, the military strength of the two countries is not at the same level. The Qin army destroyed Jicheng, the capital of the Yan Kingdom, and the King of Yan and the King of Yan fled to Liaodong. The Qin army continued to pursue and defeated the last main force of the Yan army in Yanshui. Prince Dan was also killed by his own people and presented to King Qin. Qin also left Yan temporarily.

After Qin destroyed Wei and Chu in 223 BC, Wang Jian's son Wang Ben led troops into Liaodong and captured the Yan Kingdom, which was completely destroyed.