《宋书·列传·卷八十七》
刘勔于是竖起长围，在东南角修治攻城道路，且填满城池，东南角有高楼，队长赵法进献计说： 从外面进攻，必定首先攻打城楼，城楼颓落，既伤士兵又使士气受损，不如首先击毁。 
勔于是乃竖长围，治攻道于东南角，并填堑。东南角有高楼，队主赵法进计曰： 外若进攻，必先攻楼，楼颓落，既伤将士，又使人情沮坏，不如先自毁之。 
Liu Xi then erected a long fence, repaired the siege road in the southeast corner, and filled the city. In the southeast corner there was a tall building, and the captain Zhao Fa suggested that: If we attack from the outside, we must first attack the building. The collapse of the building will not only injure the soldiers but also damage their morale. It is better to destroy it first.