Hong-wu: Year 15, Month Intercalary 2, Day 23
7 Apr 1382
The Yong-chang Marquis Lan Yu, "Deputy General of the Left for Subduing the South", and the Xi-ping Marquis Mu Ying, deputy general of the right, advanced the troops to Da-li, attacked it and captured it. The walls of Da-li City rest against Mt. Dian-cang and to the West, it is bounded by the Er River. The native chieftain Duan Shi heard that the government troops were soon to arrive and massed his troops to firmly guard the Lower Pass. The Lower Pass is the Long-wei Pass which was constructed by Pi-luo-ge of Nan-zhao. It is famous as a strategic position. When Yu and so on reached Pin Dian, they sent the Ding-yuan Marquis Wang Bi to take troops from Er-shui east to the Upper Pass to form a flank force, and then they led the troops towards the Lower Pass. They manufactured assault implements and then sent the Commissioner-in-chief Hu Hai-yang and others to proceed, at the fourth drum of night, from Shi-men by a side road and across the river. After circling around Mt. Dian-cang, they clawed their way up to the top of the mountain and then erected our banners there. Just on day-break our army reached the Lower Pass and saw the banners. They leapt about, screaming and clamouring, and the chieftain's troops were frightened and confused. Ying personally led the troops forward and whipped the horses across the river, where the water came up to the horses bellies. The troops then followed them and none dared be last. They subsequently took the pass and entered. The troops on the hill were observing this and they also attacked. The chieftain's troops were thereby attacked from front and rear and were routed. The city was thus taken and Duan Shi was captured. The subsidiary force captured He-qing, seized Li-jiang, smashed Shi-men Pass and proceeded to Jin-chi. Thus, Che-li, Ping-mian and other places successively came to allegiance and all the yi were pacified.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 5, page 2246/47