《新唐书·列传·卷一百四十七》
前泸州刺史杨庆复为卢耽制备进攻的器械、守城的擂石，设置牢城兵，由八个大将主管，竖立密栅，晚上点火把照城。守城的兵械既锐且新。
故泸州刺史杨庆复为耽治攻具、蔺石，置牢城兵，八将主之，树笓格，夜列炬照城，守具雄新。
The previous prefect of Luzhou, Yang Qingfu, prepared siege weapons and defensive stones for Lu Tan and established a strong garrison, managed by eight generals, and set up thick palisades. At night, he lit torches to illuminate the city. The weapons for defending the city were both sharp and new.