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简介：In addition to siege engines and ladders, Li Zicheng actually liked to use two other methods to attack the city. One method is to dig out the bricks at the base of the city wall, hollow out the bottom, leave an earth pillar at intervals, and then put a rope on it, and let tens of thousands of people pull the rope. If the pillar is pulled down, without foundation support, the city wall will collapse. fall down.