The Three Changes Of Northern Song’s Military Strategy To Liao Dynasty During The Period Of974-989

The late beginning in mid tenth Century, the new Northern Song Dynasty graduallyunified war at the same time, also is faced with by the Later Zhou Dynasty inherited, betweenthe north and the Khitan Liao regime founded by territorial disputes. Song Taizu hasmaintained a military defense situation in Song Liao border, on the other hand, Liao andestablished informal diplomatic relations official. Although the two sides frequent militaryfriction, but basically maintained peace.Song Taizong ascended the throne at the beginning to maintaining and Liao and peacefuldiplomatic relations, but this peaceful relations with Song Taizong in nine seven four ad, driveto destroy the North Han war ended. Hope to build up establishment of psychological andLiao Dynasty sent troops to support the North Han revenge, Song Taizong launched a majormilitary offensive to regain Youyun area as the target, the peaceful diplomatic relationsbetween the two sides to break.This paper mainly focuses on974years of Song Dynasty "Xiong state parliament ofNorthern Expedition" to989years during the fifteen years of transition process of Liaomilitary strategy "aggressive, active defense and passive defense" was analyzed in detail,outline the changing process in detail, especially for the strategy of active defense theprevious mentioned fewer stages, will be given some explanation; at the same time wereanalyzed in many aspects to the reasons of three transformation.Song-Liao war is China ancient military history important component, for the politicalsituation in Northeast Asia has produced profound influence, also has considerablesignificance to the reality.