李元吉
In summer 622, Liu, with Turkish reinforcements, tried to return to the region. Li Yi was unable to stop him. With Li Shimin having already returned to Chang'an at that point, Emperor Gaozu sent another son of a cousin, Li Daoxuan () the Prince of Huaiyang, to attack Liu, along with Li Yuanji. However, Liu's army won battle after battle, and in winter 622, Liu engaged Li Daoxuan at Xiabo (下博, in modern Hengshui), defeating and killing Li Daoxuan. Within half a month, Liu again recovered all of former Xia territory. Li Yuanji feared his power and hesitated at engaging him.