Song general Meng Gong defeated the Jin general Wu Xian .
Song general Meng Gong directed his troops to besiege the city of Caizhou , to which the last emperor of the Jurchen had fled .
Song general Meng Gong defeated the Jin general Wu Xian and directed his troops to besiege the city of Caizhou , to which the last emperor of the Jurchen had fled .