Burmese–Siamese War (1765–1767)

Burmese–Siamese War (1765–1767)
Part of Burmese–Siamese wars
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
Konbaung Dynasty (Burma)	Ayutthaya Kingdom (Siam)
Commanders and leaders
Hsinbyushin Maha Nawrahta Ne Myo Thihapate	Ekkathat † Uthumphon Taksin
Units involved
Royal Burmese Army including: Shan regiments Laotian regiments Mon levies Cassay Horse Siamese levies	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

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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