伏允
In 634, Li Daozong again served under Li Jing, this time in an operation against Tuyuhun's Busabo Khan Murong Fuyun. Tang forces achieved initial victories, but Tuyuhun forces then burned the grazing grass to cut the food supplies to Tang horses. Most Tang generals wanted to withdraw, but Li Daozong advocated continued advance, and Li Jing agreed, eventually allowing complete victory, as Murong Fuyun was killed by his subordinates, allowing his son Murong Shun, whom Tang supported, to become khan.