In summer 432, Emperor Taiwu, with Xia destroyed, began to attack Northern Yan in earnest. By fall 432, he had put Northern Yan's capital Helong (和龍, in modern Jinzhou, Liaoning) under siege. While he had several victories over Northern Yan forces, he chose to withdraw at the start of winter, after seizing a large number of Northern Yan's people and forcibly resettling them in his own state. For the next few years, he would launch yearly attacks against Northern Yan with the same pattern—seeking to weaken Northern Yan gradually. While Emperor Taiwu was concentrating on Northern Yan, he also had Northern Liang on his mind, but at the advice of his minister Li Shun (李順), he decided to wait until Northern Liang's long-time prince, Juqu Mengxun, died.