Part ofa series on the |
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| History ofSiamese–Vietnamese wars |
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| Siamese–Vietnamese War (1717) |
| Siamese–Vietnamese War (1769–73) |
| Siamese–Vietnamese War (1785) |
| Cambodian rebellion (1811–12) |
| Lao rebellion (1826–28) |
| Siamese–Vietnamese War (1831–34) |
| Lê Văn Khôi revolt (1833–1835) |
| Siamese–Vietnamese War (1841–45) |
| 20th century proxy power conflicts |
TheSiamese–Vietnamese wars were a series of armed conflicts between the SiameseAyutthaya Kingdom andRattanakosin Kingdom and the various dynasties ofVietnam mainly during the 18th and 19th centuries. Several of the wars took place in modern-dayCambodia.
The political, dynastic, and military decline of theKhmer Empire after the 15th century, known as thePost-Angkor Period, left apower vacuum in the Mekong floodplains of central Indochina. United under strong dynastic rule, both Siam to the west and Vietnam to the east sought to achieve hegemony 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.[a] 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 ofFrench Indochina put an end to Vietnamese sovereignty and to Siamese policies of regional expansion. Subsequent clashes of the two countries were 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.[2][3][b]
The roots of the conflict started at the beginning of the 14th century, when Tai people busily expanded their states and came to clash with established Vietnamese state in the east. During the latter centuries, as the Vietnamese expanding southward to the lower Mekong, they came to conflict with Cambodia and the Siamese state.[5]
| No. | Name | Results | Notes |
|---|---|---|---|
| 1 | Sukhothai-Vietnamese War (1313)[6] | Vietnamese victory | The Kingdom of Sukhothai attacked Kingdom ofChampa, a vassal state of kingdom ofĐại Việt from the mountains but was repulsed. |
| 2 | Siamese–Vietnamese War (1717)[7][8] | Siamese victory | Two large Siamese forces invade Cambodia in an effort to help Prea Srey Thomea regain the throne. One Siamese army is badly beaten by the Cambodians and their Vietnamese allies at the Battle of Bantea Meas. The Second Siamese army captures the Cambodian capital of Udong where the Vietnamese supported Cambodian king switches allegiance to Siam. Vietnam loses sovereignty over Cambodia but annexes several border provinces of Cambodia. |
| 3 | Siamese–Vietnamese War (1771–1773)[2][7] | Siamese victory | In 1769, King Taksin of Siam invaded and occupied portions of Cambodia. The following year a proxy war between Vietnam and Siam erupted in Cambodia when the Nguyễn Lords responded by attacking Siamese cities. At the outset of the war, Taksin advanced through Cambodia and placedAng Non II on the Cambodian throne. The Vietnamese responded by recapturing the Cambodian capital and installingOutey II as their preferred monarch. In 1773, the Vietnamese made peace with the Siamese in order to deal with theTây Sơn rebellion, which was a result of the war with Siam. Two years later Ang Non II was proclaimed the ruler of Cambodia. |
| 4 | Siamese–Vietnamese War (1785)[9] | Vietnamese victory | First Siamese invasion of Southern Vietnam Decisive victory of theTây Sơn force |
| 5 | Cambodian rebellion (1811–12) | Vietnamese victory | Vietnamese forces restoreAng Chan to the Cambodian throne |
| 6 | Vietnamese intervention inLao rebellion (1826–1828)[10] | Siamese victory | Vietnamese supportedAnouvong to revolt against Siam but failed |
| 7 | Lê Văn Khôi revolt (1833–1835)[11] andSiamese–Vietnamese War (1831–1834) | Vietnamese victory | Second Siamese invasion of Southern Vietnam Siam supports the revolt. Vietnamese defensive victory, invasion ofCambodia |
| 8 | Cambodian rebellion (1840) | Cambodian-Siamese victory | Siamese-Vietnamese jointly installedAng Duong on the Cambodian throne |
| 9 | Siamese–Vietnamese War (1841–1845)[3] | Draw | Siamese and Vietnamese incursions in Cambodia Cambodia becomes vassals of both Siam and Vietnam |
| 10 | Franco-Siamese conflict of 1893 (Vietnam as part ofFrench Indochina) | French-Vietnamese victory | French invasion of Laos Laos becomes part of French Indochina |
| 11 | Franco-Thai War (1940–41)(Vietnam as part ofFrench Indochina) | Indecisive | Thai invasion of French Indochina Disputed territories given to Thailand byJapan |
| 12 | Thai intervention to Vietnam | North Vietnamese victory | Thai involvement as part of the allies Fall of Saigon |
| 13 | Vietnamese border raids in Thailand | Status quo ante bellum | Withdrawal of Vietnamese troops from the border in 1989 |