Francis Light, however, failed to secure British military assistance against Siam[6] and Kedah came under Siamese suzerainty.

Phraya Nakhon Noi had already organized a fleet of 7,000 men at Trang and Satun in his preparations against the speculated Burmese invasions.

Pretending to launch attack on Mergui and Tenasserim Coast, Phraya Nakhon Noi requested the Sultan of Kedah for provisions.

When the Kedahan did not arrive to provide supplies, Nakhon Noi headed his fleet towards Alor Setar in November 1821.

[11] Sultan Ahmad Tajuddin managed to flee the city and took refuge on Penang Island, then under British control.

Siam imposed the direct rule through Ligor and installed Siamese personnel in Kedah, thus the sultanate ceased to exist for a time.

For his victory over Kedah, Rama II raised Nakhon Noi to the rank of Chaophraya and granted his son Phra Phakdiborirak the title of Phraya Aphaithibet.

This prompted Marquess of Hastings, the Governor-General of India, to send John Crawfurd to Bangkok, leading to the first contact between Siam and the British Empire in the Rattanakosin period.

Crawfurd arrived in Bangkok in April 1822, he presented the personal letter of Sultan Ahmad Tajuddin to King Rama II blaming Nakhon Noi "the Raja of Ligor" for the incidents.

Three years later in 1825, Chaophraya Nakhon Noi prepared a fleet to invade and conquer the sultanates of Perak and Selangor.

Robert Fullerton warned the Raja of Ligor that the Siamese invasion of the sultanates would violate the Anglo-Dutch Treaty of 1824 but went unheeded.

One group reached the Pattani River and invested Songkhla for three months but were driven back to Kedah by the 2,000 Siamese along with their 500 Chinese allies.