Battle of Rạch Gầm-Xoài Mút

Battle of Rạch Gầm-Xoài Mút
Part of Tây Sơn wars and Siamese–Vietnamese Wars

Vietnamese monument of the battle
Date1784 – 1785
Location
Rạch Gầm River and Xoài Mút River
(near Mỹ Tho River, in present-day Tiền Giang Province, southern Vietnam)
Result Tây Sơn defensive victory; Saimese-Cambodian armies retreat back to Laos
Belligerents
Tây Sơn Rattanakosin Kingdom (Siam)
Kingdom of Cambodia
Nguyễn lords
Hà Tiên Protectorate
Commanders and leaders
Nguyễn Huệ
Nguyễn Lữ
Trương Văn Đa
Đặng Văn Trấn
Bùi Thị Xuân
Trần Quang Diệu
Võ Văn Dũng
Krom Luang Thepharirak
Phraya Wichitnarong
Phraya Thatsada
Chaophraya Aphaiphubet (Baen)

Nguyễn Ánh
Lê Văn Duyệt
Lê Văn Quân
Nguyễn Văn Thành
Nguyễn Văn Oai 
Mạc Tử Sinh
Units involved
Tây Sơn Army Siamese Army
Siamese Navy
Nguyễn Ánh's forces
Strength
30,000 men
55 warships
100 sailing ships
300 small canoes
132 cannons
Total: 30,000+
Siamese-Cambodian: 40,000 sailors
30,000 infantry
300 warships
3,000–4,000 Nguyễn Ánh's forces
Total: 73,000+
Casualties and losses
Unknown, but less than opponent Warships: near annihilation
Siamese-Cambodian soldiers: 40,000+ killed
Nguyễn forces: 3,200 killed

The Battle of Rạch Gầm-Xoài Mút (Vietnamese: Trận Rạch Gầm – Xoài Mút, Thai: การรบที่ซากเกิ่ม-สว่ายมุต) was fought between the Vietnamese Tây Sơn forces and an army of Siam in present-day Tiền Giang Province of Vietnam on January 20, 1785. It is considered one of the greatest victories in Vietnamese history.