Research On Military Status In Yuanzhou Area In Tang Dynasty

Yuanzhou is located between the Ningxia Plain,Loess Plateau,Guanzhong Plain,Long Mountain range,Qinlong Mountain range,Longzhong Plateau,Hexi Corridor and other important geographical areas.It is mountainous on three sides of the territory and relatively flat along the Weiru river in the north.It can reach the surrounding areas through the valley roads and waterways in the territory.Therefore,Yuanzhou was mostly invaded by nomadic people from the North,so it was an important part of the northwest frontier for the regime that established the Guanzhong.In Tang dynasty,the military status of Yuanzhou changed dynamically.At the beginning of Tang dynasty,based on the unsteady Guanzhong,Xueju forces of qinlong invaded to the east,operating pingliang on the one hand,and threatening Chang'an on the other hand along the Jingyuan road to the east.The Tang Dynasty after hard fighting to eliminate the Xue,control Jingyuan road,to create conditions for the long river.Unwilling to become stronger after the elimination of the Tang Dynasty,the Turks invaded south for years,often choosing the original state as the road and plundering the surrounding areas.The Tang Dynasty put up a strong defense in Jingyuan road to check the Turkic offensive.The Taizong dynasty wiped out the East Turkestan,and the frontier moved forward.Lingzhou became an important place for frontier defense,and the original state became inland,and its military status declined.At that time,Yuanzhou had a prominent advantage in communication between the East and the West and between the North and the South.It was the eastern section of the Silk Road and the northern route,promoting economic and cultural exchanges between China and foreign countries.The geographical environment of Yuanzhou was suitable for the development of animal husbandry,which became an important part of the northwest animal husbandry of the Tang dynasty.In the middle Tang dynasty,the Tibetan army occupied helong and invaded the inner part of the pass.Yuanzhou was the starting point for the Tibetan army's invasion.Due to the physical reasons of Tibetan people,the attack was cyclical,often autumn attack,the original state became the Tibetan operation of winter pasture.Facing the Tibetan offensive,the Tang Dynasty set up Jingyuan town for the army of the four towns of Anxi and Beiting,in coordination with the double defense of Bin Ning town.With the establishment of the frontier defense system in Northwest frontier,the frontier defense situation in the Tang Dynasty improved.Due to their own interests,many mutinies took place in the army of the four towns and Beiting,which made the Tang court distrusted them.After the "Change of Jing division",the Tang Dynasty cleaned the ranks of troops in the original town to make the town stable.Through the management of Jingyuan town,Jingyuan road's defense was improved,and the border was pushed to Pingliang and Tanzheng Gorge in Yuanzhou.As the Tang Dynasty and Tibetan were unwilling to fight any more,the two sides repaired and a peaceful situation appeared on the Northwest frontier,which also led to the conservative state of mind of the court in the Late Tang Dynasty,and it was difficult for them to take the initiative to fight and recover the lost territory.And Tibetan civil unrest,so that Xuanzong dynasty recover including the original state of the three states seven.However,the decline of the state,unable to expand the border,the state of the military status of the fall again.The army of Huangchao uprising dealt a heavy blow to the Tang Dynasty,and Yuanzhou fell again in the chaos of war.The duty of Jingyuan town shifted from external defense to balancing the vassal towns at homeland.