《资治通鉴·唐纪·唐纪三》
窦建德带千名骑兵走在前面，过黎阳三十里，李世派骑兵将领丘孝刚率领三百骑兵侦察窦建德的军情。
建德以千骑前行，过黎阳三十里，李世勣遣骑将丘孝刚将二百骑侦之。
Dou Jiande led thousands of cavalry in the front, passing Liyang for 30 miles. Li Shimin sent cavalry general Qiu Xiaogang to lead 300 cavalry to spy on Dou Jiande's military situation.