《资治通鉴·唐纪·唐纪六十三》
唐武宗命刑部侍郎兼御史中丞李回出使安抚河北的幽州、成德、魏博三个藩镇，令幽州乘秋季早日平定回鹘余部；令成德和魏博早日进兵平定昭义的叛乱。
上遣刑部侍郎兼御史中丞李回宣慰河北三镇，令幽州乘秋早平回鹘，镇、魏早平泽潞。
Tang Wuzong ordered the Shizhong (Minister of Justice) and concurrent Zhongcheng (Assistant Ministerial Censor) Li Hui to visit Hebei to comfort the three provincial towns of Youzhou, Chengde and Weibo. He ordered Youzhou to take advantage of the early autumn to pacify the remaining Huihu tribes; he ordered Chengde and Weibo to send troops as soon as possible to put down the rebellion in Zhaoyi.