Kingdom of Vientiane
After the defeat of China, a Lê prince, Lê Duy Chỉ (黎維祗), fled to Tuyên Quang and Cao Bằng. There, Chỉ was supported by native chieftain Nùng Phúc Tấn (儂福縉) and Hoàng Văn Đồng (黃文桐). Chỉ devised a plan to unite Vientiane and Muang Phuan in a revolt of Tây Sơn dynasty. An army under Trần Quang Diệu conquered Muang Phuan and executed their chiefs. Then, the army invaded Kingdom of Vientiane; king Nanthasen fled, Tây Sơn marched west till the border of Siam. The victorious army attacked Bảo Lộc, captured Lê Duy Chỉ, Nùng Phúc Tấn, Hoàng Văn Đồng, and had them executed. Horses, elephants and war drums were brought to Vietnam as booty of war, then handed over to Qing China as tribute, Quang Trung did it to show power to China. Quang Trung also requested for exemption from customs duties, and established a "yá háng" (牙行, broker house in ancient China) in Nanning, they were both agreed by the Qianlong Emperor.