《旧五代史·后唐·庄宗纪三》
这个月，梁将戴思远侵犯德胜北城，筑垒挖沟，地道云梯，昼夜攻击，李存审极力把守，城中危急。
是月，梁将戴思远寇德胜北城，筑垒穿堑，地道云梯，昼夜攻击；李存审极力拒守，城中危急。
This month, Liang general Dai Siyuan invaded the Decheng North City, built fortifications, dug trenches, created underground tunnels and scaling ladders, and attacked day and night. Li Chunxian defended with all his might, but the city was in danger.