Ancient times: At the end of the Warring States Period, Li Xin, a young general of Qin, led 200,000 troops to attack Chu. At first, Qin Jun even counted several cities, which was overwhelming. Soon, Li Xin was ambushed by Chu Xiang Army, abandoned his helmet and armor, and fled in a hurry, losing tens of thousands. Later, the king of Qin began to use Wang Jian, who retired in his later years. Wang Jian led 600,000 troops, and Chen Bing was on the border of Chu. The Chu army immediately sent heavy troops to meet the enemy. Veteran Wang Jian, no intention to attack. He just concentrated on building the city and put on a firm look. When the two armies confront each other, war is imminent. Chu Jun was eager to repel Qin Jun, and it was deadlocked for 10 years. Wang Jian encouraged the soldiers in the army to recharge their batteries, eat, drink and rest. Qin Jun soldiers are all strong and energetic. They usually practice hard to improve their skills. Wang Jian was very happy. A year later, Chu Jun's taut string has loosened, and the soldiers have no fighting spirit. They thought that Qin Jun was really defending itself, so they decided to retreat eastward. Seeing that the time had come, Wang Jian ordered the pursuit of the retreating Chu army. Everyone in Qin Jun went down the mountain like a tiger, just to kill the Chu army in their escape. Qin Jun's 56-point victory was overwhelming. In 223 BC, Qin destroyed Chu.
Modernity: This is the classic tactic of the army under the leadership of the Communist Party of China. There are many examples For example, in the War of Liberation, when the East China Field Army attacked Jinan, it encircled and helped and defeated Huang.