The Siamese-Vietnamese wars were a series of armed conflicts between the Siamese Ayutthaya Kingdom and Rattanakosin Kingdom and the various dynasties of Vietnam mainly during the 18th and 19th centuries. The political, dynastic and military decline of the Cambodian kingdom since the 15th century had left a power vacuum in the Mekong floodplains of central Indochina. United under strong dynastic rule, Siam to the west and Vietnam to the east, both sought to become hegemon in the lowland region and the Lao mountains. The Siamese introduced - and Vietnam soon followed - the hostage system for Cambodian royals, who were relocated to their courts, actively undermining royal affairs and shaping future Cambodian policies. Eventually territory was annexed by both powers, who conceived, maintained and supported their favorable Cambodian puppet kings. Actual combat mainly took place on Cambodian territory or on occupied lands. The 19th century establishment of French Indochina put an end to Vietnamese sovereignty and to Siamese policies of regional expansion. Subsequent clashes of the two countries are not caused by regional rivalry, but must be viewed in the context of the 20th century imperial policies of foreign great powers and the Cold War.
By the 15th century, the Vietnamese Lê dynasty had been able to annex the modern-day provinces of Lai Châu and Điện Biên in an attempt to conquer the Lan Xang (Lao Qua) kingdom and pacify the Muang Phuan principality of Laos. However, this conflict also involved and was fought on Siamese and Burmese soil. As a result Vietnamese forces under Lê Thánh Tông continued to occupy territory in northern Siam for some additional 10 years. Siam, incapable to oppose this incursion therein saw the origin for all future conflict between the two nations.
List of Siamese-Vietnamese warsEdit
|1||Siamese–Vietnamese War (1717–18)||Siamese victory||Siamese invasion of Cambodia, seizing the capital Oudong and ransacking Ha Tien for the first time|
|2||Siamese–Vietnamese War (1769–73)||Inconclusive||Siamese in control invading Cambodia and ransacking Ha Tien again, but failing to defeat the Vietnamese forces|
|3||Siamese–Vietnamese War (1785)||Vietnamese victory||First Siamese invasion to Southern Vietnam |
Decisive victory of the Vietnamese force
|4||Cambodian rebellion (1811–12)||Siamese strategic victory
Vietnamese tactical victory
|First Siamese and then Vietnamese forces invade Cambodia in order to support and enthrone their vassal kings and overthrow their opponent|
|5||Lao rebellion (1826–28)||Siamese victory||Vietnamese supported Anouvong to revolt against Siam but failed|
|6||Lê Văn Khôi revolt (1833–1835) and Siamese–Vietnamese War (1831–34)||Vietnamese victory||Second Siamese invasion to Southern Vietnam |
Siam supports the revolt. Vietnamese defensive victory, invasion of Cambodia
|7||Siamese–Vietnamese War (1841–45)||Inconclusive||Siamese and Vietnamese incursions in Cambodia |
Cambodia becomes vassals of both Siam and Vietnam
|8||Franco-Siamese War (1893) (Vietnam as part of French Indochina)||French-Vietnamese victory||French invasion of Laos |
Laos becomes part of French Indochina
|9||Franco-Thai War (1940–41)(Vietnam as part of French Indochina)||Indecisive||Thai invasion of French Indochina |
Disputed territories given to Thailand by Japan
|10||Thai intervention to Vietnam||North Vietnamese victory||Thai involvement as part of the allies |
Fall of Saigon
|11||Vietnamese border raids in Thailand||Inconclusive||Insurgency of Khmer Rouge |
Undeclared war, but Vietnam achieved the goal of Khmer Rouge's destruction
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