《资治通鉴·唐纪·唐纪五》
离窦建德营地三里处，李世民等与窦建德的游兵相遇，游兵以为他们是侦察敌情的斥候。
去建德营三里所，建德游兵遇之，以为斥候也。
Three li away from Dou Jiande's camp, Li Shimin and others met Dou Jiande's scouts, who thought they were scouts reconnoitering the enemy.