《明史·本纪·卷五》
遂命千余人守桥，半夜渡到小河以南，绕到平安军后。
乃令千余人守桥，夜半渡河而南，绕出安军后。
So he ordered more than a thousand people to guard the bridge, crossed the river to the south of Xiaohe in the middle of the night, and went around to the back of Ping'an army.