he should visit the legislative and examination (門下省, Menxia Sheng) bureaus every two or three days to serve as an alternative head of those bureaus. Later in 634, Tuyuhun attacked Tang. Emperor Taizong was considering whom to send as the commander of the counterattacking force, and he made the comment, "It would have been wonderful to have Li Jing as commander." When Li Jing heard this, he personally met with the chancellor Fang Xuanling and offered to be the commander. Emperor Taizong was pleased, and made Li Jing the commander, assisted by the other generals Hou Junji, Li Daozong, Li Daliang, Li Daoyan (李道彥), and Gao Zengsheng (高甑生). Tang forces achieved initial victories against Tuyuhun forces; in response, Tuyuhun burned the grass on grazing fields to try to cut off the Tang horses' food supplies, and the Tang generals mostly believed that they should retreat them. Hou advocated attacking, however, and Li jing agreed, pushing deep into Tuyuhun territory and greatly defeating them, capturing the wives and sons of Tuyuhun's Busabo Khan Murong Fuyun. Murong Fuyun's son Murong Shun surrendered, and Murong Fuyun was soon killed by his subordinates. Emperor Taizong created Murong Shun the new khan, and Tang forces largely withdrew, although Li Daliang remained. During the campaign, on one occasion, Li Jing rebuked Gao for arriving late, but did not punish him. Gao nevertheless was displeased with Li Jing's rebuke, and he and the official Tang Fengyi (唐奉義) accused Li Jing of plotting treason. The matter was investigated, and the evidence was found lacking. Gao and Tang were accused of false accusations and exiled, notwithstanding pleas by others that Gao contributed to Emperor Taizong's ambush at Xuanwu Gate against Li Jiancheng. However, from this point on, Li Jing refused to receive guests, and he even did not see his relatives often. In 637, as a part of Emperor Taizong's scheme to bestow prefectures on his relatives and great generals and officials as their permanent domains, Li Jing's title was changed to Duke of Wei, and he was given the post of prefect of Pu Prefecture (濮州, roughly modern Heze, Shandong), to be inherited by his heirs. Soon, however, with many objections to the system, the strongest of which came from Zhangsun Wuji, Emperor Taizong cancelled the scheme, although Li Jing's title remained Duke of Wei. In 640, Li Jing's wife died, and Emperor Taizong ordered that a large