《资治通鉴·汉纪·汉纪二》
到半夜时分，韩信传令部队出发，挑选两千名轻骑兵，每人手拿一面红旗，从小道上山隐蔽起来，观察赵军的动向；并告诫他们说： 交战时赵军看到我军退逃，必会倾巢出动来追赶我们，你们即趁机迅速冲入赵军营垒，拔掉赵军的旗帜，遍插汉军的红旗。 
夜半，传发，选轻骑二千人，人持一赤帜，从间道萆山而望赵军。诫曰： 赵见我走，必空壁逐我；若疾入赵壁，拔赵帜，立汉赤帜。 
At midnight, Han Xin ordered his troops to set off. He selected 2,000 light cavalrymen, each carrying a red flag, to hide on the mountain via a small path and observe the movements of the Zhao army; he cautioned them, “When the battle begins, the Zhao army, upon seeing our army in retreat, will definitely pursue us in full force; then you must seize the opportunity to charge into the Zhao army camp, pull out their flags, and plant red Han flags everywhere.”