《资治通鉴·唐纪·唐纪七十六》
蕲州大将贾公铎正在城外打猎，不能返回，贾公铎把军队埋伏在树林里，命令勇猛士兵二人身披羊皮乘夜进入朱延寿的驻地，掠赶羊群，偷偷进入城内，与城里的人相约半夜时候打开城门举起火把相接应，这两个人又身披羊皮回到贾公铎的营地，报告情况。
大将贾公鐸方猎，不得还，伏兵林中，命勇士二人衣羊皮夜入延寿所掠羊群，潜入城，约夜半开门举火为应，复衣皮返命。
Jia Gongduo, the leading general of Qizhou, was hunting outside the city and could not return. Jia Gongduo ambushed his army in the forest and ordered two brave soldiers to cover themselves with sheepskin and enter Zhu Yanshou's station at night. They drove the sheep and sneaked into the city, where they made an alliance with the people in the city to open the city gate at midnight and raise the torch. The two men then returned to Jia Gongduo's camp covered with sheepskin and reported the situation.