《资治通鉴·汉纪·汉纪四十八》
秋季，七月，段派遣一千余人在西县用木柱结成栅栏，纵深二十步，长达四十里，进行遮挡。
秋，七月，颎遣千人于西县结木为栅，广二十步，长四十里遮之。
In the seventh month of autumn, Duan sent more than 1,000 people to build a wooden fence in Xixian, which was 20 paces deep and 40 li long, for cover.