《资治通鉴·后唐纪·后唐纪二》
己巳，后唐帝命令宣武节度使李嗣源率领三万七千名警卫部队赶到汴州，不久又去幽州抵御契丹人的侵略。
己巳，命宣武节度使李嗣源将宿卫兵三万七千人赴汴州，遂如幽州御契丹。
On Ji-si, the emperor of Later Tang ordered Li Sizhang, governor of Xuanshe Jiedushi, to lead 37,000 guards and rush to Bianzhou, and soon go to Youzhou to fight against the invasion of the Khitan.