《明史·列传·卷一百八十二》
李自成占据西安，遣其将李过以精兵数万攻取三边，延安、绥德相继被占领。
李自成遂据西安，遣其将李过以精卒数万徇三边，延安、绥德相继陷。
Li Zicheng occupied Xi'an, and sent his general Li Guo to lead tens of thousands of elite soldiers to attack the three sides, and Yan'an and Suide were successively occupied.