In the autumn of 1004 (the first year of Jingde, Zhenzong of the Song Dynasty), Empress Dowager Xiao of Liao and Shengzong of Liao personally led an army southward and penetrated deep into the Song Dynasty.Some ministers advocated fleeing south to avoid the enemy. Song Zhenzong also wanted to flee south. Because of the urging of Prime Minister Kou Zhun, he went to Chanzhou to supervise the war.The Song army defended the town behind the Liao army, and shot Liao general Xiao Talan (一zuolin) at the foot of Chanzhou City.