《资治通鉴·后周纪·后周纪三》
乙酉，韩令坤突然到达扬州；天大亮，先派遣白延遇率数百骑兵奔驰入城，城中没有觉察。
乙酉，韩令坤奄至扬州。平旦，先遣白延遇以数百骑驰入城，城中不之觉。
On day Yiyou, Han Lingkun suddenly arrived in Yangzhou; at daybreak, he sent Bai Yanyu to lead hundreds of cavalry into the city, but the city did not notice.