In summer 444, eight nephews of the Tuyuhun khan Murong Muliyan (慕容慕利延), after their brother Murong Weishi (慕容緯世) had been put to death by their uncle, surrendered to Northern Wei and suggested that he attack Tuyuhun. In response, Emperor Taiwu sent his son Tuoba Fuluo (拓拔伏羅) the Prince of Jin to attack Tuyuhun and defeated Tuyuhun forces, forcing Murong Muliyan to flee into the Bailan Mountains (白蘭山, in modern southwestern Qinghai). In 445, with Emperor Taiwu's distant cousin Tuoba Na (拓拔那) the Prince of Gaoliang in pursuit, Murong Muliyan fled west and occupied Yutian (Khotan). (However, after a few years, Tuyuhun would return to its original position.)