Nguyễn Nhạc
Ánh began to reorganize a strong armed force in Siam. He left Siam (after thanking King Rama I), and returned to Vietnam. During the 1787 war between Nguyễn Huệ and Nguyễn Nhạc in northern Vietnam, Ánh recaptured the southern Vietnamese capital of Gia Định. Southern Vietnam had been ruled by the Nguyễns and they remained popular, especially with the ethnic Chinese. Nguyễn Lữ, the youngest brother of Tây Sơn (who ruled southern Vietnam), could not defend the citadel and retreated to Quy Nhơn. The citadel of Gia Định was seized by the Nguyễn lords.