《资治通鉴·唐纪·唐纪六》
唐幽州总管李艺率领他的几万部队会同秦王李世民讨伐刘黑闼，刘黑闼闻讯，留下一万兵力，命范愿守卫州，自己率军抵抗李艺。
幽州总管李艺将所部兵数万会秦王世民讨刘黑闼，黑闼闻之，留兵万人，使范愿守洺州，自将兵拒艺。
Li Yi, the Governor General of Yizhou of the Tang Dynasty, led his tens of thousands of troops to join forces with Li Shimin to attack Liu Hetuo. Liu Hetuo, ordered Fan Yuan to guard the state and led his army to resist Li Yi.