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简介：——Starting from halfway up the mountain, fortresses were built against the mountain one after another, made of rammed earth and stone, connected by trenches in the middle. The Ming Army's Sun and Moon flag and the Jingwu Camp's Flying Tiger flag were flying everywhere, and some roads were winding. Wrapped around the mountain, all the barriers are lined up. It looks like they are fortified layer by layer, but in fact each layer has its own system.