Han Tuozhou and the War with the Jin
Han Tuozhou, who was related to the imperial family by marriage, dominated the court for more than a decade. His great ambition was to recover the northern territories lost to the Jurchens some eighty years earlier.
The Kaixi War, 1206–1208
Believing that the Jin had been weakened by natural disasters, Han encouraged raids across the border and formally declared war in June 1206. The Song offensive soon stalled. Despite their own difficulties, the Jin repulsed the attacks and launched counter-attacks of their own.
Song morale fell, supplies ran short and many soldiers deserted.
In December 1206 Wu Xi, the commander in Sichuan who guarded the western front, defected to the Jin. Before the Jin could take over his territory, he was assassinated by Song loyalists in March 1207.
By the end of 1207 the war had reached a stalemate: the Song were on the defensive, and the Jin could make no lasting gains in Song territory. The failure cost Han Tuozhou his life. In December 1207 he was beaten to death by palace guards, in a plot organised by Shi Miyuan with the support of Empress Yang.
The Peace of 1208
The peace treaty signed in 1208 restored the Song's annual payments to the Jin and raised them to 300,000 taels of silver and 300,000 bolts of silk a year. The Jin, who held Han responsible for the war, also demanded his head, and the Song sent it north.
In 1211 the Mongols, formerly tributaries of the Jin, attacked them. As the Jin lost ground, the Song stopped paying tribute but took care not to provoke open war. In 1217 the Jin, seeking to make up for their losses in the north, attacked the Song.