 From 1127 to 1129 , the Song sent thirteen embassies to the Jin to discuss peace terms and to negotiate the release of Gaozong 's mother and Huizong , but the Jin court ignored them . In December 1129 , the Jin started a new military offensive , dispatching two armies across the Huai River in the east and west . On the western front , an army invaded <unk> , the area where the Song <unk> <unk> resided , and captured <unk> ( <unk> , present @-@ day <unk> ) . They were ordered to retreat a few months later when the eastern army withdrew . 
