Map to illustrate the Siamese question.

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In this year, 1861, the Sultan of Trengginu visited Singapore, and complained to the Governor that it was reported the
Siamese intended to depose him by force. On the receipt of
further information to the same tenor, the Governor of the
Straits protested, through H. M.'s Consul at Bangkok, against
any Siamese interference in Trengganu, pointing out that such
action would constitute an infraction of the treaty.
On receipt of the Governor's remonstrance the King of
Siam denied the rumour and matters remained quiet for some
months.
The first King of Siam meanwhile married the sister of the
ex-Sultan of Lingga, and in 1862 sent word to the Sultan of
Trengghnu to prepare to receive the ex-Sultan, then living in
Bangkok. At the same time the ex-Sultan was sent to
Trengganu, and to the same place went Inche WAN AHIIMED,
who had been for some time living in Kelantan.
The Governor of the Straits Settlements (Colonel, now
General, Sir ORFEUR CAVENAGH), seeing in this meeting the
prospect of further troubles in Pahang, sent letters to the Sultan of Trengganu desiring his Highness to send the ex-Sultan
of Lingga back to Bangkok.
The Sultan did not, however, do as he was desired, and after
a good deal of correspondence, two vessels-of-war visited Trengganu, with a Civil Officer bearing the ultimatum from the
Governor to the Sultan. As the Governor's request was not
complied with the Sultan of Trengginu's fort was shelled by
the British vessels.
The Siamese Government, which, in reply to the representation of General CAVENAGH, had promised to remove the exsultan from Trengganu, did not carry out its engagement till
March, 1863, and that only after the strong action described.
The measures taken by Governor CAVENAGH were justified
in the following papers which were printed in October, 1863.
The first is a narrative of events, while the two letters to H.
M.'s Consul at Bangkok maintain the treaty independence of
the States of Trengganu and Kelantan.