Murong Bao, who settled in at Longcheng, made Murong Nong his prime minister. At Murong Nong's suggestion, Murong Bao initially stopped his thoughts of regaining the lost provinces, but in early 398, against the advice of Murong Nong and Murong Sheng the Prince of Changle, Murong Bao resolved to try to advance south—but his army was worn out. As soon as Murong Bao left Longcheng, his general Duan Sugu (段速骨) started a rebellion, and the army abandoned Murong Bao, who immediately fled back to Longcheng. Meanwhile, Duan, having forced Murong Long's son Murong Chong (慕容崇) the Prince of Gaoyang as leader, sieged Longcheng. Even with secret help from Lan Han the Prince of Dunqiu—Murong Chui's uncle—however, Duan was initially unsuccessful, until Murong Nong inexplicably, in fear of his life, surrendered to him. This greatly destroyed the morale of Longcheng's defense forces, as everyone relied on Murong Nong's leadership, and Longcheng fell to Duan. Duan imprisoned Murong Nong, but his strategist Ajiao Luo (阿交羅) suggested that Murong Nong might be a better puppet than Murong Chong. Upon hearing this news, however, Murong Chong's attendants Zong Rang (鬷讓) and Chuli Jian (出力犍) assassinated Ajiao and Murong Nong.