In 1786, Nguyễn Huệ led his army to the north of Việt Nam with the cause of assisting the Lê dynasty and defeating Lord Trịnh.
Main events from 1786 to 1788 After the defeat of Lord Trịnh in Thăng Long, the leader of the Tây Sơn, Nguyễn Nhạc ordered Nguyễn Huệ to bring his troops back to Phú Xuân.