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 [REF].
The Tây Sơn swiftly occupied the territory surrounding the Citadel of Quy Nhơn, including the vital Thị Nại Port.