《资治通鉴·唐纪·唐纪七十五》
李克用给朱全忠回信说： 倘若你在邺下确实驻有强兵，那么我恭候大军的到来；如果一定真要分出胜负，请到常山脚下决战。 
克用复书： 倘实屯军鄴下，颙望降临；必欲真决雌雄，愿角逐于常山之尾。 
Li Keyong replied to Zhu Quanzhong: If you do indeed have a strong army stationed in Yexia, then I will await the arrival of your troops; if you are determined to fight for victory, please come to the foot of Changshan mountain for a decisive battle.