Lê Chiêu Thống
The circumstances in Vietnam were not successful either. In 1787, Lê Chiêu Thống, the last ruler of the Vietnamese Lê dynasty, fled from Vietnam and formally requested to be restored to his throne in Thăng Long (present-day Hanoi). The Qianlong Emperor agreed and sent a large army into Vietnam to remove the Tây Sơn (rebels who had captured all of Vietnam). The capital, Thăng Long, was conquered in 1788, but a few months later the Qing army was defeated, and the invasion turned into a debacle due to the surprise attack during Tết (Vietnamese New Year) by Nguyễn Huệ, the second and most capable of the three Tây Sơn brothers. The Qing Empire no longer supported Lê Chiêu Thống, and his family were imprisoned in Vietnam. The Qing would not intervene in Vietnam for another 90 years.