《明史·列传·卷五十八》
于是增加兵力防守真、保、涿、易各府州，请求派大臣镇守山西，防备敌寇往南方入侵。
乃益兵守真、保、涿、易诸府州，请以大臣镇山西，防寇南侵。
They then added more troops to defend the prefectures of Zhenjiang, Baoding, Zhuozhou, and Yizhou. They asked for a high minister to be sent to defend Shanxi, in order to prevent the enemy from invading the south.