侯君集
After the Tuyuhun attack on Liang Prefecture, Emperor Taizong decreed that a major campaign against Tuyuhun shall be carried out. He wanted to make the general Li Jing his commander, but felt that Li Jing was getting advanced in age (63 at the time), and initially decided not to do so. However, when Li Jing heard this, he requested to go, which pleased Emperor Taizong, who made him the commander of the overall operation, with Hou Junji, Li Daozong, Li Daliang, Li Daoyan (李道彥), and Gao Zengsheng (高甑生) serving under him, supplemented by Tujue and Qibi troops. In the initial stage of the campaign, some Dangxiang and Qiang tribes, apparently fearing that they would be involved, rebelled against Tang and fled to join Tuyuhun.