《后汉书·列传·袁绍刘表列传上》
袁绍将营垒相连，逐步推进，慢慢迫近官度，于是双方会战，结果曹军失利，又退回营垒坚守。
连营稍前，渐逼官度，遂合战。操军不利，复还坚壁。
Yuan Shao set up camps one after another and advanced step by step, slowly approaching Guandu. The two sides fought a battle, and as a result, Cao's army was defeated and retreated back to the camp.