As he joined under the authority of commander-in-chief Ri Keigen, who served as Chushorei (imperial edict), superintendent general for the Toga section, repression delegate to the Xihe region, and governor-general of Zenshu, he advanced against Toban, together with the commander of the Ekishu region, Ri Koitsu, and governor-general of the Zenshu region, Taku Oho, and defeated Toban at Ryushi (present-day Southeast district, Qinghai Province).
総指揮官である中書令、洮河道行軍大総管・西河鎮撫大使・鄯州都督の李敬玄の指揮下に入り、益州長史李孝逸、嶲州都督拓王奉などとともに進軍し、龍支（現在の青海省東南地区）で吐蕃と戦い、これを撃ち破った。