《明史·本纪·卷二十四》
十一日，李自成到宣府，负责监视宣府的太监杜勋投降，巡抚都御史朱之冯等被杀。
己亥，李自成至宣府，监视太监杜勋降，巡抚都御史朱之冯等死之。
On the 11th, Li Zicheng arrived at Xuanfu. The eunuch Du Xun who was responsible for monitoring Xuanfu surrendered, while the touring governor-general and chief censor Zhu Zhifeng and others were killed.