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In China Cold War era , the city is very effective against the war means , since the Qin Dynasty to the Sui and Tang dynasties , the battle has been in the military plays an important role. With the escalation of the war , fortresses offensive and defensive warfare became increasingly frequent and intense , not only to urge the rulers of the city more to build bigger , making large-scale, but also to force them to intensify the reform fortification technology to enhance the city at Defense philosophy. Sui and Tang dynasties of the city through several thousand years of development , has been formed to be customized , a typical representative of Chang'an and Luoyang Sui built the city , their location, layout , size and many other factors all reflect China's economic , cultural , technology and other aspects of the enormous technological advances . Especially Tang Jianli , its economy and prosperity of the strong force , in order to further expand the city more military defense construction provides a guarantee. Along with raising the level of city construction , other military technology as its secondary infusion has also been a lot of new content, such as metallurgy, machinery, vehicles , water, mining and so on. They have been fully developed at this time and have been comprehensively applied to the city among the military defense . From a military perspective, the city is also a tactical offensive and defensive military technology , it is on the basis of inheriting former , also in this period a new leap forward. Interactions affect the use of these technologies to improve the city the ability to make a significant contribution at Defense , but also reflected the people 's use of nature and extent of changes in depth .
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