Between 230 and 225 BC, the Qin state adopted a series of tactics to implement a war of unification. Changshi Li Si and others formulated a detailed strategy, which included first destroying the three states of Han, Zhao, and Wei, then controlling the Central Plains, and finally conquering the states of Chu, Yan, and Qi. This strategy is considered to be the key to Qin's success in unifying the Six Kingdoms.
Han Fei likes. Korea became the first target of Qin's unification war. This was because Korea was located in the southern part of the Central Plains region, and controlling the region was strategically important for the unification of the Qin state. In addition, Korea was weaker, which gave Qin a greater military advantage. The Qin army launched a series of offensives that put Korea under pressure.
Statue of Li Mu. After attacking Korea, the Qin army turned to attack the state of Zhao. The state of Zhao experienced a major drought, which gave the state of Qin a chance to attack. The state of Zhao was weakened by economic hardship and popular famine. The Qin army saw this opportunity and took advantage of the chaos within the Zhao state to quickly advance and capture key cities and fortresses.
Statue of Wang Jian. Then, Qin turned its attention to Wei. In order to break through the Great Liang City of Wei, the Qin army adopted a unique strategy. They dug up rivers and brought water to the city of Daliang. The influx of water led to flooding in the city of Daliang and caused serious distress and threat to the soldiers and people of the Wei state. Faced with the threat of floods, Wei was eventually forced to surrender, and Qin successfully wiped out Wei.
The "joint vertical" strategy of the countries to unite against the Qin state was unsuccessful. The purpose of this strategy was to jointly resist the Qin attack by uniting against Qin. However, the Qin state adopted a strategy of division and disintegration, by destroying alliances and exploiting internal contradictions, so that the countries could not form a unified resistance force. The failure of this strategy led to Han, Zhao, and Wei becoming the first victims of Qin's unification war. Their strength and geographical location allowed the Qin State to eliminate these three states with relative ease.
Between 230 and 225 BC, the Qin state succeeded in eliminating the three states of Han, Zhao, and Wei through a combination of flexible strategies, geographical advantages, and other factors. They first destroyed Korea, then took the opportunity to attack Zhao, and finally defeated Wei using the river water strategy. This history shows the strategic wisdom and strength of the Qin state in the war of unification, as well as the difficulties and failures of the joint confrontation of other countries. Through the unification war of the Qin state, a unified state was gradually formed in the Central Plains, which laid the foundation for the later Qin dynasty.