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简介：——Different from the beginning, in the past two years, Jianlu gradually had some restraint methods and experiences against the Ming army's city bombing techniques. In addition to passive prevention such as burying jars and flooding, and digging holes under the city walls, After the passage, in addition to the active method of flooding the Ming army with a large amount of water and drowning all the Ming troops in the tunnel, there were two important defensive methods.