In addition, there is an orientation memory method: according to the geographical location of the six eastern countries, first destroy the middle three countries, Korea, Zhao and Wei (between the north and the south), and then destroy the other three countries, Chu Yanqi (between the north and the south).

The time when the six countries perished.

1, defeated Korea. In 230 BC, Qin Shihuang sent Nestor to March in, captured Wang An of North Korea, and set up Yingchuan County (now Yuxian County, Henan Province) in the old place of North Korea, and South Korea declared its demise. The demise of South Korea is a symbol of the all-round development of the Qin unification war.

2. break Zhao and force Yan. After Qin destroyed Korea, the second goal was Zhao. In 229 BC, Zhao suffered a series of major earthquakes and famines. Qin Shihuang once again ordered Wang Jian and Yang Duan to launch an all-out attack on Zhao. Wang Jian used double agents to buy Guo Kai, the courtier of Zhao Wang, slandered Li Mu and others, saying that they were going to rebel, prompting Zhao Wang to kill Li Mu.

In 228 BC, Wang Jian defeated the Zhao army, occupied Handan, captured Zhao's family and occupied Zhao's native land. Then it moved north, stationed in Zhongshan (Dingxian County, Hebei Province) and approached the State of Yan.

3. Break the Yan State. The practice caused panic among Yan and Dai. Prince Dan of Yan took in Fan, a traitor of Qin State, and met the assassin Jing Ke through Tian Guang, a warrior of Yan State, in an attempt to assassinate Qin Shihuang. However, Jing Ke's failure to kill Qin Shihuang aroused Qin Shihuang's anger towards Yan State. In 226 BC, Qin Jun captured Ji Cheng (now Beijing) in Yan Dou, and Wang Xi and Taizi Dan of Yan fled to Liaodong.

4. Occupy Wei land. After conquering the thrips in Yan Dou, he turned his finger at Wei. In 225 BC, Qin Shihuang sent Wang Ben, the son of Wang Jian, to attack Wei with 654.38 million troops. Seeing that Daliangcheng was low-lying, not far from the Yellow River and the gap, Wang Ben ordered Qin Jun to open a canal to bring the water from the Yellow River and the gap to Daliangcheng.

Three months later, the city wall collapsed and Qin Jun entered the girder. Wei surrendered, was killed soon, and Wei also perished.

5. Cutting Chu on a large scale. In 225 BC, Qin Shihuang sent Li Xin to attack Chu. Li Xin underestimates his enemy, winning first and then losing. In 224 BC, Qin Shihuang personally invited veteran Wang Jian to lead 600,000 troops to attack Chu. Destroy the Chu army in the south, kill Xiang Yan, the general of Chu, and occupy a large territory of Chu. In 223 BC, Wang Jian and Wu Meng jointly attacked Shouchun, the capital of Chu, and captured the king of Chu alive.

The following year, Wang Jian led an army to cross the river, pacify the Jiangnan area of Chu and surrender to Baiyue King. Chu declared its demise.

6. swallow. After the demise of Chu, Qin Shihuang sent Wang Ben to the northeast to sweep away the remnants of Yanzhao. In 222 BC, Wang Ben captured Liaodong and Yan. Then he captured Daicheng and captured Daiwang Jia. Yan and Zhao were wiped out. At this point, only Qi was left in the six eastern countries. In 22 1 BC, Qin Shihuang ordered Wang Ben to lead Qin Jun to attack Qi from the border of Yan.

Wang Ben suddenly attacked Linzi (Zibo), the capital of Qidu, without any resistance. Wang Qi surrendered to the State of Qin, and Qi was also included in the territory of Qin.