《资治通鉴·陈纪·陈纪七》
北齐国主派长乐王尉世辩率领一千多骑兵窥测北周军队的情况，出了滏口，登上土山向西面了望，远远地看见一群乌鸦腾空而起，以为是北周军队的旗帜，立即驰马返回；到了紫陌桥，还不敢回头看。
齐主使长乐王尉世辩，帅千余骑觇周师，出滏口，登高阜西望，遥见群乌飞起，谓是西军旗帜，即驰还；比至紫陌桥，不敢回顾。
The monarch of Northern Qi sent King Changle Wei Shibian to lead more than a thousand cavalry to spy on the Northern Zhou army. After leaving Fuzikou, he climbed a hill and looked west. He saw a group of crows flying into the air from a distance, thinking they were the banners of the Northern Zhou army, and immediately galloped back; when he reached Zimoqiao, he still did not dare to look back.