 Wanyan Liang ( the Prince of Hailing ) led a coup against Emperor Xizong and became fourth emperor of the Jin dynasty in 1150 . Wanyan Liang presented himself as a Chinese emperor , and planned to unite China by conquering the Song . In 1158 , Wanyan Liang provided a casus belli by announcing that the Song had broken the 1142 peace treaty by acquiring horses . He instituted an unpopular draft that was the source of widespread unrest in the empire . Anti @-@ Jin revolts erupted among the Khitans and in Jin provinces bordering the Song . Wanyan Liang did not allow dissent , and opposition to the war was severely punished . The Song had been notified beforehand of Wanyan Liang 's plan . They prepared by securing their defenses along the border , mainly near the Yangtze River , but were hampered by Emperor Gaozong 's indecisiveness . Gaozong 's desire for peace made him averse to provoking the Jin . Wanyan Liang began the invasion in 1161 without formally declaring war . Jurchen armies personally led by Wanyan Liang left Kaifeng on October 15 , reached the Huai River border on October 28 , and marched in the direction of the Yangtze . The Song lost the Huai to the Jurchens but captured a few Jin prefectures in the west , slowing the Jurchen advance . A group of Jurchen generals were sent to cross the Yangtze near the city of Caishi ( south of Ma 'anshan in modern Anhui ) while Wanyan Liang established a base near Yangzhou . 
 Wanyan Liang ( the Prince of Hailing ) led a coup against Emperor Xizong and became fourth emperor of the Jin dynasty in 1150 . Wanyan Liang presented himself as a Chinese emperor , and planned to unite China by conquering the Song . In 1158 , Wanyan Liang provided a casus belli by announcing that the Song <a href='been_done' title='1'><mark>had</mark></a> broken the 1142 peace treaty by acquiring horses . He instituted an unpopular draft <a href='null_relcl' title='2'><mark>that</mark></a>was the source of widespread unrest in the empire . Anti @-@ Jin revolts erupted among the Khitans and in Jin provinces bordering the Song . Wanyan Liang did not allow <a href='negative_concord' title='3'><mark>dissent</mark></a> , and opposition to the war was severely punished . The Song <a href='been_done' title='4'><mark>had</mark></a> been notified beforehand of Wanyan Liang <a href='null_genetive' title='5'><mark>'s</mark></a>plan . They prepared by securing their defenses along the border , mainly near the Yangtze River , but <a href='uninflect' title='6'><mark>were</mark></a> hampered by Emperor Gaozong <a href='null_genetive' title='7'><mark>'s</mark></a>indecisiveness . Gaozong <a href='null_genetive' title='8'><mark>'s</mark></a>desire for peace made him averse to provoking the Jin . Wanyan Liang began the invasion in 1161 without formally declaring war . Jurchen armies personally led by Wanyan Liang left Kaifeng on October 15 , reached the Huai River border on October 28 , and marched in the direction of the Yangtze . The Song lost the Huai to the Jurchens but captured a few Jin prefectures in the west , slowing the Jurchen advance . A group of Jurchen generals <a href='uninflect' title='9'><mark>were</mark></a> sent to cross the Yangtze near the city of Caishi ( south of Ma 'anshan in modern Anhui ) while Wanyan Liang established a base near Yangzhou . 
Wanyan Liang ( the Prince of Hailing ) led a coup against Emperor Xizong and became fourth emperor of da Jin dynasty in 1150 . Wanyan Liang presented hisself as a Chinese emperor , and planned to unite China by conquering the Song . In 1158 , Wanyan Liang provided a casus belli by announcing that tdaSong done broken the 1142 peace treaty by acquiring horses . He instituted an unpopular draft was the source of widespread unrest in the empire . Anti @-@ Jin revolts erupted among the Khitans and in Jin provinces bordering thdaong . Wanyan Liang did not allow no dissent , and opposition to the war was severely punished . Thedang done been notified beforehand of Wanyan Liang  plan . They prepared by securing their defenses along the border , mainly near the dagtze River , but was hampered by Emperor Gaozong  indecisiveness . Gaozong  desire for peace made em averse to provoking the Jda. Wanyan Liang began the indaion in 1161 w/o formally declaring war . Jurchen armies personally led by Wanyan Liang left Kaifeng on October 15 , reached the Huai River border on October 28 , and marched in the dirdaion of the Yangtze . The Song lost the Huai to the Jurchens but captured a few Jin prefectures in the westdaslowing the Jurchen advance . A group of Jurchen generals was sent to cross the Yangtdanear the city of Caishi ( south of Ma 'anshan in modern Anhui ) while Wanyan Liang established a base near Yangzhou .