《元史·本纪·卷三十二》
二十二日，阿速卫指挥使脱脱木儿统率其军马从上都来归，随即命他防守古北口。
壬子，阿速卫指挥使脱脱木儿帅其军自上都来归，即命守古北口。
On the 22nd, Tuotuo Mu'er, the commander of the Asuwei guards, led his troops from Shangdu. He was immediately ordered to defend Gukou.