 Meanwhile , the eastern army , commanded by Wanyan Zongwang , was dispatched towards Yanjing ( modern Beijing ) and eventually the Song capital Kaifeng . It did not face much armed opposition . Zongwang easily took Yanjing , where Song general and former Liao governor <unk> <unk> ( <unk> ) switched his <unk> to the Jin . When the Song had tried to reclaim the Sixteen Prefectures , they had faced fierce resistance from the Han Chinese population , yet when the Jurchens invaded that area , the Han Chinese did not oppose them at all . By the end of December 1125 , the Jin army had seized control of two prefectures and re @-@ established Jurchen rule over the Sixteen Prefectures . The eastern army was nearing Kaifeng by early 1126 . 
