韩世忠
The Jurchens again assembled another force in 1137, consisting of seventy thousand men and began the fourth invasion. Losing many experienced soldiers through the previous invasions, the Jurchens this time had poorer results and after a few battles were almost completely routed. The Chinese force under Yue Fei and Han Shizhong quickly took advantage of the situation and began a counterattack. The Song were victorious in a number of battles including the Battle of Yancheng in 1139. Less than a year afterwards, Song troops almost reached the Jin capital.