The Study On The Related Issues Of The Defense Along The Yangtze River In The Early Years Of The Southern Song Dynasty

The Southern Song Dynasty established in Jiangnan region,relied on the river for solid.The defence along the river was the key of its national defense.In the early years of The Southern Song Dynasty,it always fought with Jin Dynasty,The land along the river have been attacked.To protect the elementary,Song court continuously strengthened military layout along the river,and adjusted defensive works strategy according to its National situation and war situation,made the Yangtze river natural barrier played a prominent role in defense.At the early years of The Southern Song Dynasty,in order to cope with the threat of Jin army,the Southern Song Dynasty adopted a variety of ways and measures to strengthen the defense along the Yangtze river.Song Ting actively promote defense,set Shuaifu,Yaojun,organized water army,warships,appointed YanJiang defense officials.At the same time,Yangtze river local officials to organize the local tyrants,militia to participate in the river guarding.These Jiang defense has played a certain role in defense,deepened the understanding of the importance of defense along the Yangtze river in the Southern Song Dynasty.However,due to the implementation of defense measures ineffective,lack of operational confidence and other reasons,the Southern Song Dynasty failed to stop Jin army crossing the south.The early years of the Southern Song Dynasty,Jiang defense strategy several changes,experienced Jiangnan to Jiangbei,back Jiangnan.Changes in the Southern Song Dynasty Jiang defense strategy mainly around the relationship between Yangtze river and the Huai area.In general,the Jiang defense strategy changed from positive to negative.With the progress development between Song and Jin,the main force of the Southern Song Dynasty returned from Jiangbei to Jiangnan,Jiang defense strategy tends to be negative.Overall,the early years of the Southern Song Dynasty defense along the Yangtze river had made great development,to strengthen the control of the area along the Yangtze river,and repressed Jin's attack,so that its regime could be stable in Jiangnan region gradually,eventually it became an important part of the Southern Song Dynasty national defense system.