《三国志·魏书·二公孙陶四张传》
袁绍在城外设置伏兵突击，大败公孙瓒部队，公孙瓒之后又退回城中死守。
绍设伏击，大破之，复还守。
Yuan Shao set up an ambush outside the city and attacked, defeating Gongsun Zan's army. Gongsun Zan then retreated into the city and defended himself.