sentences:  Afterwards, Nguyễn Ánh appointed Võ Tánh as the new governor of the city and withdrew his main forces to Saigon.In early 1800, two senior Tây Sơn generals, Tran Quang Dieu and Vu Van Dung, led a large force consisting of army and naval units toward Quy Nhơn with a view to recapturing it.The Tây Sơn swiftly occupied the territory surrounding the Citadel of Quy Nhơn, including the vital Thị Nại Port.