intervention as it would broaden the war. Cavenagh demanded that Siam retrieve Mahmud Muzaffar back to Bangkok and sent gunboats to Kuala Terengganu, pressing the Terengganu sultan to surrender. When Terengganu did not yield, British warships bombarded Terengganu, leaving fires and damages. Mahmud Muzaffar eventually returned to Siam. As Terengganu was Siam's tributary state, Chaophraya Thiphakorawong (Kham Bunnag) the Phrakhlang protested the incident to London, urging for investigation. British parliament criticized Cavenagh for his attacks on 'friendly town' and instructed British naval commanders not to attack without orders of the Admiralty. British India had acquired Lower Burma in aftermath of the Second Anglo-Burmese War in 1852. In 1866, after difficulties, British India sent a special commissioner Edward O'Riley to meet with Siamese delegate Phraya Kiat the Mon officer at Three Pagodas Pass in 1866 to explore and demarcate Anglo-Siamese borders between Siam and British Burma in Tenasserim Hills from Salween River to Andaman Sea. Border agreement treaty was signed in 1868, becoming definition of modern Myanmar-Thailand borders. Thomas George Knox: 1868–1879 Thomas George Knox arrived in Siam in 1851 when he was hired by Vice-King Pinklao to train modernizing Front Palace armies. Knox married a Tavoyan woman and had children with her including his daughter Fanny Knox. Thomas Knox then switched to diplomatic career, becoming vice-consul in 1857, consul in 1865 and consul-general in 1868. Acquainted with Siamese elite circle, Knox politically supported Pinklao and his lineage and became rather an ally of Si Suriyawong. With ascension of King Chulalongkorn in 1868 under regency of Si Suriyawong, Prince Wichaichan, Pinklao's son, was made Vice-King of Front Palace. When Knox was away in 1868, Chinese-Siamese tax collectors burnt down some British opium houses in Bangkok. Henry Alabaster the acting consul pressed for compensation from Siamese court. Si Suriyawong, who was the patron of tax collectors, vehemently defended his subordinates. When Knox returned, he ruled in favor of Si Suriyawong. The disgraced Alabaster resigned and left Siam. King Chulalongkorn assumed personal rule in 1873 and appointed Henry Alabaster, nemesis of Si Suriyawong, to be his royal advisor. During the Front Palace Crisis in 1874-75, when Knox was absent again, the acting consul Newman acted in concert with Knox's interest to support and provide shelter to Prince Wichaichan in British consulate. When Sir Andrew Clarke the governor of Straits Settlements, who had earlier maintained cordial correspondences with King Chulalongkorn, arrived in February 1875