 In 310, Tuoba Yulü was ordered by Tuoba Yilu to assist Liu Kun (劉琨), the Governor of Bingzhou (并州) (modern Shanxi province), to fight the Xiongnu Tiefu chieftain Liu Hu.In 316 Tuoba Yulü became the Prince of Dai upon the death of Tuoba Pugen's unnamed infant son.In 318, he defeated the Tiefu chieftain Liu Hu and also captured some territory from the Wusun.