Yong-le: Year 2, Month 8, Day 20
24 Sep 1404
Previously, the eunuch Yang Xuan and others had been sent with Imperial orders of comfort and instruction for the native officials of Meng-ding, Meng-yang, Mu-bang, Lu-chuan, Che-li, Ba-bai, Laos, Gu-la, Zhao-min-te-ling and Dong-wu. At this time, the route of Xuan and so on passed through Ba-bai/Da-dian and there they were obstructed by the native official Dao Zhao-san and were unable to advance.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 10, page 588/89