Early walls very simple, such as Henan Anyang ruins after Tun Kuanjin 2-4 meters low wall rammed earth walls, Baotou eastern suburbs Ashanti Canqiang ruins at only 1.7 meters high stone walls and so on. Because it is too short, and even the foundations of these walls do not need. But do not underestimate ugg boots sale cope when its called war, not if called fights battle, it was enough. The late Longshan Culture, which is Five Emperors era, with the tribes flourished in the true sense of the city began to appear.
This wall plate built using advanced construction method,cheap ugg boots, that is, first ramming steep walls on both sides and then to protect the city slope reinforcement, this method can increase the height at the same time, the slope of the simultaneous growth inhibition, so that the wall is more steep difficult to attack. With such a large wall appear higher, in order to avoid problems caused by soil subsidence, foundation engineering has become an essential one. BC 21 century, the history of China 's first empire - summer, was established. But empire building does not promote cheap coach bags the development of the Xia Dynasty garrison facilities, the ancient city of Pingliang Taiwan 's defense level is also not beyond the end of their history.
At this point the wall is not only more tall,cheap uggs, and work is also more detailed. Allende shovel cut through the smooth slope, it will scour the rubble covered with water proof. Interior features ram ram interlayer nest, so tamping layer scary, more solid walls. Unfortunately, in addition to smooth along the tall meticulous development, from business to the Western Zhou Dynasty, the city defense technology no new content. This may be due to the then defense capabilities far beyond the development of means of attack, right ? Attack the weakness of nature can not motivate to keep progress. Until the Spring and Autumn period, with the vehicle manufacturing technology advances, finally into the big siege technology development period.
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