History of the Northern Dynasties: On the dangerous road of Dadoubagu, wind, rain and sleet separated him from his palace women, and most of his…
On the dangerous road of Dadoubagu, wind, rain and sleet separated him from his palace women, and most of his soldiers froze to death.
癸卯，經大鬥拔谷。山路隘險，魚貫而出，風霰晦暝，與後宮相失。士卒凍死者大半
Location: 北史 卷12 大業5年
Passing through the Dadoubo Valley, the mountain paths were steep and blizzards scattered the soldiers, most of whom froze to death.
士卒凍死者太半
Location: 隋書 卷003 帝紀 大業5年6月