《资治通鉴·唐纪·唐纪六十八》
几天之后，南诏军又取民间的篱笆，用水浇湿后编成竹篷，兵将在其下举着进抵城下，一时城上矢石不能入，火也不能燃烧。
后数日，贼取民篱，重沓湿而屈之，以为蓬，置人其下，举以抵城而劚之，矢石不能入，火不能然。
A few days later, the Nanzhao army took the local fences, soaked them in water, and then made them into bamboo sheds, the soldiers held them and approached the city, for a while, the arrows and stones from the city could not get into the shed, nor could the fire burn them.