우문술
In 608, Pei persuaded the Tiele tribes to attack Tuyuhun, and Tiele forces defeated Tuyuhun forces. Murong Fuyun took his people east, entering Sui's Xiping Commandery (西平, roughly modern Xining, Qinghai) to ask for refuge and aid against the Tiele. Emperor Yang sent his cousin Yang Xiong (楊雄) the Prince of Ande and Yuwen Shu the Duke of Xu to escort Murong Fuyun. As Yuwen's forces approached, however, Murong Fuyun became apprehensive of the strength of his forces and decided to flee. Yuwen attacked him, and was said to have killed 3,000 Tuyuhun soldiers, and captured some 200 Tuyuhun nobles and 4,000 households. Murong Fuyun fled southwest into the mountains. Sui took over former Tuyuhun lands and divided it into four commanderies, settling minor criminals in those lands.