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The final stage is the number of new developments in the Tang Dynasty. Fortifications aspects of development are mostly based on the strengthening of the Warring States prior art,cheap uggs uk, such as Fu battlements evolved heavy city, that city within a city, Feng Yuan evolved from the bunker -style fortifications - yangmachang city, as well as attacks against the bed crossbow at the gate, corner of the city, until the entire surface of the brick wall of brick city etc. Only crossbow Taiwan is an exception. Crossbow units is square, root side length of 14 meters, 15 meters ugg store high, the top side length 7 meters, surrounded by a rammed earth wall. Taiwan bottom opening, the defenders of the rope ladder to climb through the patio table top.
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