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Burmese–Siamese War (1765–67)

Burmese–Siamese War (1765–1767)
Part of Burmese–Siamese wars
Burmese-Siamese war (1765-1767) map - EN - 001.jpg
  • Sketch-map showing Burmese forces' advance towards Ayutthaya:
  • The territories showed are those at the time being
  •      Siam
  •      Burma and its vassals (Vientiane, Luang Prabang, etc.)
  •      Third territories (Cambodia, etc.)
  •      Routes of advance (Main attack routes, "A" and "C")
  •      Present-day border
Date 23 August 1765 – 7 April 1767
(1 year, 7 months, and 15 days)
Location Tenasserim, Siam
Result Burmese victory
End of Ayutthaya Kingdom
Territorial
changes
Burma temporarily captures Ayutthaya and permanently annexes lower Tenasserim
Belligerents
Flag of the Alaungpaya Dynasty of Myanmar.svgKonbaung Dynasty (Burma) Flag of Thailand (Ayutthaya period).svg Ayutthaya Kingdom (Siam)
Commanders and leaders
Flag of the Alaungpaya Dynasty of Myanmar.svg Hsinbyushin
Flag of the Alaungpaya Dynasty of Myanmar.svg Maha Nawrahta
Flag of the Alaungpaya Dynasty of Myanmar.svg Ne Myo Thihapate
Flag of Thailand (Ayutthaya period).svg Ekkathat 
Flag of Thailand (Ayutthaya period).svg Uthumphon
Flag of Thailand (Ayutthaya period).svg Taksin
Units involved

Flag of the Alaungpaya Dynasty of Myanmar.svg Royal Burmese Army including:

Flag of the Alaungpaya Dynasty of Myanmar.svg Shan regiments
Flag of the Alaungpaya Dynasty of Myanmar.svg Laotian regiments
Flag of the Alaungpaya Dynasty of Myanmar.svg Mon levies
Flag of the Alaungpaya Dynasty of Myanmar.svg Cassay Horse
Flag of the Alaungpaya Dynasty of Myanmar.svg Siamese levies
Flag of Thailand (Ayutthaya period).svg Royal Siamese Army
Strength

Initial invasion force:
40,000 to 50,000

  • Northern front: 20,000
  • Southern front: 20,000–30,000

Nonthaburi: 20,000
Outer Ayutthaya: 50,000

Siege of Ayutthaya: 40,000+

Initial defenses:

  • Northern front: unknown
  • Southern front: over 60,000

Nonthaburi: 60,000
Outer Ayutthaya: 50,000
1 British ship

Siege of Ayutthaya: unknown

Flag of the Alaungpaya Dynasty of Myanmar.svg Royal Burmese Army including:

Initial invasion force:
40,000 to 50,000

Nonthaburi: 20,000
Outer Ayutthaya: 50,000

Initial defenses:

Nonthaburi: 60,000
Outer Ayutthaya: 50,000
1 British ship

The Burmese–Siamese War (1765–1767) (Burmese: ယိုးဒယား-မြန်မာစစ် (၁၇၆၅–၁၇၆၇); Thai: สงครามคราวเสียกรุงศรีอยุธยาครั้งที่สอง, lit. "war of the second fall of Ayutthaya") was the second military conflict between the Konbaung Dynasty of Burma (Myanmar) and the Ban Phlu Luang Dynasty of Siam (Thailand), and the war that ended the four-century-old Siamese kingdom. Nonetheless, the Burmese were soon forced to give up their hard-won gains when the Chinese invasions of their homeland forced a complete withdrawal by the end of 1767. A new Siamese dynasty, to which the current Thai monarchy traces its origins, emerged to reunify Siam by 1770.

This war was the continuation of the war of 1759–1760. The casus belli of this war was also the control of the Tenasserim coast and its trade, and the Siamese support for the rebels in the Burmese border regions. The war began in August 1765 when a 20,000-strong northern Burmese army invaded northern Siam, and was joined in by three southern armies of over 20,000 in October, in a pincer movement on Ayutthaya. By late January 1766, the Burmese armies had overcome numerically superior but poorly coordinated Siamese defences, and converged before the Siamese capital.


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