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Siamese invasion of Kedah

1821 military operation

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Through East India Company

Background

The Sultanate of Kedah had been a tributary state to Siam during the Ayutthaya period, though the extent of Siamese influence over the northern Malay sultanates varied over time. After the Fall of Ayutthaya in 1767, the northern Malay sultanates were temporarily freed from Siamese domination. In 1786, Francis Light managed to obtain a lease of Penang Island from Sultan Abdullah Mukarram Shah of Kedah on behalf of British East India Company in exchange for British military support against the Siamese or Burmese. In the same year, Siam re-exerted control over the northern Malay sultanates and sacked Pattani. Francis Light, however, failed to secure British military assistance against Siam and Kedah came under Siamese suzerainty. The bunga mas was sent triennially to the Bangkok court.

During the Burmese Invasion of Phuket in 1809, Sultan Ahmad Tajuddin Halim Shah II, who was known in Thai sources as "Tuanku Pangeran" (Thai: ตวนกูปะแงหรัน), contributed a sizable force from Kedah to aid the Siamese against the Burmese. In 1813, King Rama II commanded Sultan Ahmad Tajuddin to bring the Sultanate of Perak under Siamese control. Sultan Ahmad Tajuddin then sent forces to capture and occupy Perak on behalf of Siam in 1818. This earned Sultan Ahmad Tajuddin favor of the Siamese king, who raised the Sultan to the rank of Chaophraya – which was superior to Nakhon Noi, the governor of Ligor or Nakhon Si Thammarat, who held the rank of Phraya. In 1811, Sultan Ahmad Tajuddin came into conflict with his brother Tunku Bisnu. Tunku Bisnu approached Phraya Nakhon Noi of Ligor and sought Siamese support. Tunku Bisnu was then made the ruler of Setul.

In 1820, King Bagyidaw of Burma planned another invasion of Siam, in which the Kedah Sultanate would inevitably become involved. Tunku Mom, a younger brother of the Sultan, informed Phraya Nakhon Noi that the Sultan of Kedah was forming an alliance with the Burmese against Siam. Lim Hoi, a Phuket-based Chinese merchant caught a Burmese ship bearing a Burmese letter to the Sultan Ahmad Tajuddin. Phraya Nakhon Noi then relayed the information to the Bangkok court. Rama II ordered the Sultan of Kedah to go to Bangkok to explain. The Sultan however, did not go and ceased sending the bunga mas. Rama II then ordered Phraya Nakhon Noi of Ligor to invade the Kedah Sultanate in 1821.

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