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Battle of Rạch Gầm-Xoài Mút

When
1783–1787
Where
Mekong Delta towns; Rạch Gầm-Xoài Mút area; Mekong River; Bangkok
Episodes
4

The Battle of Rạch Gầm-Xoài Mút occurred on 20 January 1785 in present-day Tiền Giang province. Tây Sơn forces under Nguyễn Huệ ambushed a Siamese fleet attempting to aid Nguyễn Ánh. The engagement resulted in the near annihilation of the Siamese navy, forcing survivors to retreat to Bangkok while Nguyễn Ánh fled to refuge.

Episodes

  1. 1783-1784 · Mekong Delta townsSiamese Occupation of Mekong Delta

    Siamese forces occupied multiple Mekong Delta towns by late 1784, committing atrocities against Vietnamese settlers while preparing to attack Gia Định.

  2. 19 January 1785 · Rạch Gầm-Xoài Mút areaTây Sơn Ambush Preparation

    Nguyễn Huệ secretly positioned infantry and artillery along the Mekong River near Mỹ Tho, anticipating a Siamese attack on his headquarters.

  3. 20 January 1785 · Mekong RiverBattle of Rạch Gầm-Xoài Mút

    Siamese forces left Trà Tân to attack Mỹ Tho, where Nguyễn Huệ's headquarters was located, leading to their near annihilation.

  4. March 1785 - August 1787 · BangkokSiamese Retreat and Nguyễn Ánh's Flight

    Surviving Siamese leaders retreated to Bangkok by March 1785, while Nguyễn Ánh fled to islands and sought refuge in Bangkok until August 1787.

Background and detail

Background. Following the overthrow of the Nguyễn lords by the Tây Sơn brothers in 1777, Siamese forces intervened in southern Vietnam to support Nguyễn Ánh. By late 1784, Siamese troops had occupied several Mekong Delta towns. Nguyễn Huệ marched south from Quy Nhon, arriving in Cochinchina in January 1785 to confront the Siamese presence.

Prelude. Siamese forces committed atrocities against Vietnamese settlers, prompting a response from the Tây Sơn. Nguyễn Huệ secretly positioned infantry and artillery along the Mekong River near Mỹ Tho, anticipating a Siamese attack. The battle date was fixed on 19 January 1785, with Nguyễn Ánh notified of the planned engagement.

Aftermath. The Siamese navy was destroyed, with all ships lost according to Vietnamese sources. Surviving Siamese leaders retreated through Cambodia to Bangkok by March 1785. Nguyễn Ánh gathered remnants of his navy in Hà Tiên before fleeing to islands and eventually seeking refuge in Bangkok until August 1787.

People involved

Sources

  1. Battle of Rạch Gầm-Xoài Mút Wikipedia, revision of 2026-08-22

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.