 In the South, Nguyễn Ánh, assisted by many talented recruits from the South, captured Gia Định (present-day Saigon) in 1788 and established a strong base for his force.After Quang Trung's death, the Tây Sơn dynasty became unstable as the remaining brothers fought against each other and against the people who were loyal to Nguyễn Huệ's young son.Nguyễn Ánh sailed north in 1799, capturing Tây Sơn's stronghold Qui Nhơn.