Cambodian Rebellion (1811-1812)

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The Cambodian Usurpation of 1811-1812 was when an army from Siam supported Ang Snguon after he overthrew his brother Ang Chan; but Vietnam sent a large army to help reinstate Ang Chan at Phnom Penh.

King Ang Chan II (1791-1837) acknowledged both Siamese (Thai) and Vietnamese suzerainty over his country, Cambodia, hoping to keep the peace by paying tribute to Siam and Vietnam. Ang Chan's brother sought Siamese aid in an attempt to usurp the throne (1811); King Rama II (1768-1824) of Siam sent an army, which helped to oust Ang Chan, who fled to southern Vietnam to secure aid to regain the throne. The next year, Vietnam's Emperor Gia Long (1762-1820) sent a large force whose intimidating presence in Cambodia caused the Siamese to withdraw without fighting. Ang Chan was enthroned again.