from Sichuan to proceed to Lhasa and restore order. By the time they reached southern Tibet, the Gurkhas had already withdrawn. This counted as the first of two wars with the Gurkhas. Second campaign In 1791, the Gurkhas returned in force. Qianlong urgently dispatched an army of 10,000. It was made up of around 6,000 Manchu and Mongol forces supplemented by tribal soldiers under the general Fuk'anggan, with as his deputy. They entered Tibet from Xining in the north, shortening the march but making it in the dead of winter 1791–92, crossing high mountain passes in deep snow and cold. They reached central Tibet in the summer of 1792 and within two or three months could report that they had won a decisive series of encounters that pushed the Gurkha armies. The Nepalese outplayed with stretching tactics since the Chinese army were 3–4 times larger. Nepalese began into pull back making Chinese uncomfortably outstretched and at Nuwakot, Chinese received strong counterattack with Khukuri. Since, Nepal was expanding in the west and Fuk'anggan was keen to protect his army, both signed a peace treaty at Betrawati. The peace treaty was more favourable on Qing terms as the terms forced Nepal to pay tribute to the Qing dynasty every five years. Campaign in Đại Việt (1788–1789) Since the 17th century, Vietnam was divided into two parts: the southern part was Đàng Trong or Cochinchina, ruled by the Nguyễn lords and the northern part was Đàng Ngoài or Tonkin, ruled by the Trịnh lords under the puppet Lê emperors. In 1771, the Tây Sơn rebellion broke out in southern Vietnam, led by the brothers Nguyễn Nhạc, Nguyễn Huệ and Nguyễn Lữ, who removed the local Nguyễn lord from power. After the capture of Phú Xuân (modern Huế), Nguyễn Hữu Chỉnh, a traitor of Trịnh's general, encouraged Nguyễn Huệ to overthrow the Trịnh lord. Huệ took his advice, marched north and captured Thăng Long (modern Hanoi). In 1788, Lê Chiêu Thống was installed the new Lê emperor by Huệ. Huệ then retreated to Phú Xuân. Meanwhile, Lê Chiêu Thống never abandoned his attempt to regain the throne. Lê Quýnh, Empress Dowager Mẫn and the eldest son of Lê Chiêu Thống, fled to Longzhou, Guangxi, to seek support from Qing China. A large Qing army invaded Vietnam to restore Lê Chiêu Thống to the throne. However, the Chinese army was defeated by the Tây Sơn