《资治通鉴·汉纪·汉纪五十六》
秋季，八月，曹操大军讨伐赵犊等，杀死赵犊等人。于是，曹军又渡过潞水去援救犷平，乌桓部落退到塞外。
秋，八月，操讨犊等，斩之；乃渡潞水救犷平，乌桓走出塞。
In the autumn, in the eighth month, Cao Cao’s army attacked Zhao Du and the others, killing them all. Then the Cao army crossed the Lu River to go to Gu’anping’s aid, and the Wuhuan tribes retreated outside the Great Wall.