Murong Hui, meanwhile, on the way back to Longcheng, considered seizing power by force and finally resolved to do so. He sent assassins to kill Murong Long and Murong Nong (believing that the two uncles posed the most military threat to him), but was only successful in killing Murong Long. Murong Bao and Murong Nong's forces quickly fled to Longcheng, and Murong Hui subsequently put Longcheng under siege. Under a surprise attack led by Gao Yun, however, Murong Hui's forces collapsed, and he fled back to Zhongshan, where the remaining garrison was under the leadership of Murong Bao's cousin Murong Xiang (慕容詳) the Duke of Kaifeng. Murong Xiang killed him. Meanwhile, Murong Bao adopted Gao Yun as his own son and created him the Duke of Xiyang.