 In summer 432, Emperor Taiwu, with Xia destroyed, began to attack Northern Yan and its capital Helong (和龍, in modern Jinzhou, Liaoning) under siege.He chose to withdraw at the start of winter and would launch yearly attacks against Northern Yan to weaken it gradually over the next few years.In 436 the Yan emperor Feng Hong had to evacuate his state and fled to Goguryeo, ending Northern Yan.