, younger half-brother of King Mongkut, was the supreme commander of Siamese Expedition to Kengtung in 1852–1854. The expedition against Kengtung in 1850 did not succeed and Siam failed to support Suvanna and to gain control of Kengtung and Chiang Hung. The Qing raised an army to defeat Nokham at Chiang Hung and Nokham was killed. The Qing managed to restore Suvanna to the throne of Sipsongpanna. Amaravuth, Lady Pinkaew and Mahachai, the Tai Lue royals, who had been staying in Bangkok for about three years, took the permission of King
Mongkut to return to the north. Amaravuth and Lady Pinkaew returned to Luang Phrabang, while Mahachai returned to Nan. In 1852, Suvanna of Chiang Hung dispatched a mission, along with ceremonial golden and silver trees, to Bangkok to request the return of his family members to Chiang Hung. King Mongkut granted the permission for the Tai Lue royals to return to their homeland. However, the ministers at the court of Bangkok petitioned to King Mongkut to send another expedition into Chiang Hung. Like the previous occasion in 1850, Siam had to take Kengtung first before proceeding to Chiang Hung. Burma was then being embroiled in the
Second Anglo-Burmese War and should not be able to provided supports to Kengtung, which was a
tributary state of Burma. King Mongkut then ordered the following armies, with total number of 10,000 men, to Kengtung. On this occasion Bangkok was involved directly by sending its troops in the campaigns; •
Prince Vongsathirat Sanid, younger half-brother of King Mongkut, would lead an army through
Phitsanulok and Nan to Kengtung. •
Chao Phraya Yommaraj Nuch would lead an army through
Tak and Chiang Mai to Kengtung. He was to join by the Lanna forces under the leadership of Phraya Uparaj Phimphisan and Phraya Burirattana. The two armies planned to converge at
Chiang Saen before proceeding to Mong Hpayak and then to Kengtung.
First Expedition (1852–1853) Chao Phraya Yommaraj Nuch left Bangkok with his army in October 1852. He proceeded through
Kamphaengphet and Tak, drafting the conscripted militias along the way. Yommaraj Nuch reached Chiang Mai on December 19, 1852, where he recruited Lanna forces. Prince Vongsathirat Sanid left Bangkok November 13, 1852, with his army. He proceeded through
Nakhon Sawan, Phitsanulok, reaching Nan in January 1853. He was reinforced and supplied by Chao Phraya Mongkol Vorayot the ruler of Nan. Yommaraj Nuch and his Lanna-Siamese army left Chiang Mai for Chiang Saen in February. Prince Vongsathirat Sanid eventually reached Chiang Saen on February 17. Chao Phraya Yommaraj Nuch followed to Chiang Saen three days later. The prince ordered Chao Phraya Yommaraj Nuch to be his vanguard, with the joint Bangkok-Chiang Mai army of total 5,042 men, who left first from Chiang Saen to Mong Hpayak on February 24. Chao Phraya Yommaraj Nuch, with Lanna commanders Uparaj Phimphisan and Phraya Burirattana, managed to capture Mong Hsat in March. They proceeded to lay siege on Kengtung on March 10, 1853, taking position on a hill to the southeast of Kengtung and shelled the city with their canons. In the
Battle of Kengtung, again, Maha Khanan of Kengtung led the defense against Siamese-Lanna intruders on March 17. The Siamese-Lanna had problems with manpower shortage as they were unable to completely encircle the city of Kengtung in the siege. Another issue was that Kengtung was a hill fort and the Siamese occupied relative lowland positions, complicating the abilities of their canons to inflict damages onto the higher elevations. Prince Vongsathirat Sanid also ordered Chao Phraya Mongkol Vorayot of Nan to lead the Nan armies to Chiang Hung. Phraya Mongkol Vorayot marched his army to reach Mengpeng in February, where he sent his men to Chiang Hung to meet Tsau Suvanna of Chiang Hung and Qing delegates. Prince Vongsathirat Sanid followed his vanguard and marched through Mong Hpayak to reach Kengtung. Yommarach Nuch ordered Lanna regiment to assault on Kengtung city walls but were repelled by Maha Khanan. After seven days of battle, Kengtung did not yield and the Siamese-Lanna decided to retreat on March 23, 1853. Yommaraj Nuch marched his army back to Chiang Mai with himself going further down south to Tak, while Prince Vongsathirat Sanid retreated back to Nan. As the
rainy season approached, which would further cripple the warfare, Prince Vongsathirat Sanid then asked the king to try another expedition in the dry season next year.
Second Expedition (1853–1854) Prince Vongsathirat Sanid took the rainy season break at Nan and Chao Phraya Yommaraj Nuch at Tak. King Mongkut sent
Chao Phraya Sri Suriyawongse to bring ammunitions and supplies to the north. Sri Suriyawongse and Yommaraj Nuch traveled to meet Prince Vongsathirat Sanid at
Uttaradit, where they planned for the incoming second expedition to Kengtung, in November 1853. Chao Phraya Sri Suriyawongse then returned to Bangkok. The Siamese spent their time in Lanna farming grains for supplies during the rainy season of 1853. The Burmese, however, managed to get Bamar and Shan troops from
Mongnai to garrison at Kengtung to be additional forces. Prince Vongsathirat Sanid resumed the campaigns in dry season of the year 1853-1854. Vongsathirat Sanid and Mongkol Vorayot marched from Nan in January 1854 through Mong Yawng and Yommarah Nuch through Mong Hpayak to converge on and to lay siege to Kengtung for the second time, reaching Kengtung in March 1854. Kengtung was well reinforced by the Burmese and Shan regiments and was even better at repelling Siamese attacks. As he ran out of food supplies and gunpowder, Prince Vongsathirat Sanid finally decided to retreat from Kengtung on March 18 to Nan. However, the Burmese, upon seeing the Siamese retreat, inflicted the counter-offensive on retreating Siamese troops. Chao Phraya Mongkol Vorayot of Nan then acted as rearguard to defend the Siamese armies against the Burmese counter-attacks. Prince Vongsathirat Sanid retreated safely to Nan in 1854. Yommaraj Nuch, who had marched halfway to Kengtung, retreated to Chiang Mai upon learning of the prince's defeat. The Siamese then realized that the unfamiliar mountainous geography and great distance from Bangkok deemed the Siamese occupation of Kengtung unlikely. King Mongkut ordered Prince Vongsathirat Sanid and Chao Phraya Yommaraj Nuch to pull the troops back to Bangkok in 1854. The Tai Lue royalties had been staying in Luang Phrabang and Nan. A Qing delegated arrived in Luang Phrabang requesting for the return of Amaravuth, Lady Pinkaew and Mahachai to Chiang Hung. The Bangkok court conceded and the Tai Lue royals eventually returned to their homeland. The dynastic conflicts among the Tai Lue royals continued, however, as Mahachai later killed Amaravuth and Tsau Suvanna, in turn, had Mahachai executed. ==Aftermath==