《资治通鉴·宋纪·宋纪五》
当时漠北发生严重的旱灾，没有水草，北魏军中的人和马匹死亡很多。
时漠北大旱，无水草，人马多死。
There was a severe drought in the northern desert at that time, resulting in a lack of water and vegetation, and many personnel and horses in the Northern Wei army died.