Manipur (1756, 1758) Alaungpaya, who grew up watching Manipuri raids ransacking his home region year after year, was determined to return the favor as soon as he was able. While most of his forces were laying siege to Syriam, he sent an expedition to Manipur to "instill respect". In early 1756, the Burmese army defeated the Manipuri army and ransacked the entire country, which the Manipuris call the
First Devastation. After Lower Burma was defeated, Alaungpaya himself led another expedition in November 1758, this time to place the Burmese nominee to the Manipuri throne. His armies invaded by the Khumbat route in the Mainpur valley, and overcame fierce Manipuri resistance at
Pallel, on their march to
Imphal, the Manipuri capital. After
Pallel, the Burmese entered Imphal without firing a shot. The Konbaung armies, according to the Manipuris, committed "unspeakably cruel" crimes against the populace, inflicting "one of the worst disasters in its history". But historian GE Harvey writes: Alaungpaya "was only doing unto them as they had done unto his people". Alaungpaya raised his nominee to the Manipuri throne and returned with his army. He also brought back many Manipuri cavalry, who became elite cavalry corps (known as
Cassay Horse) in the Burmese army. (This was the start of Konbaung dynasty's long, draining involvement in Manipur. The small kingdom would prove a troublesome tributary, regularly putting up rebellions in 1764, 1768–1770, and 1775–1782. The Burmese involvement ceased after 1782 until they came back in 1814.)
Siam (1759–1760) The
Ayutthaya Kingdom was one of Southeast Asia's most wealthiest and most cosmopolitan polities in the 18th century. Prior to the Konbaung dynasty's rise, Ayutthaya Siam and Taungoo Burma had been relatively peaceful for over 150 years, with a brief period of hostilities when King
Narai of Ayutthaya launched an ill-fated expedition to vassalize Burmese-aligned Lan Na in the mid 17th century. The Konbaung dynasty had harbored to seize Ayutthaya's wealth and resources for the benefit of its own rulers. Siamese and Burmese interests in the Tenasserim have clashed on and off since the 16th century. Since the Burmese reconquest of Northern Tenasserim in the early 17th century, control of the economically lucreative Tenasserim coast was shared between Siam and Burma: Burma controlling the Northern Tenasserim ports of Mawlamyine and Tavoy while Siam controlled the Southern Tenasserim ports of Mergui and Tenasserim.
Siege of Ayutthaya After the rainy season of 1759, Alaungpaya and his armies returned to the south to deal with the still-unstable Lower Burma. One year back, a major Mon rebellion broke out, temporarily driving out the Konbaung governor of Pegu (Bago). Although the rebellion was put down, Mon resistance was still operating in the
upper Tenasserim coast (present-day Mon State), where Konbaung control was still largely nominal. Siam provided shelter to the rebel leaders and their resistance troops. Alaungpaya sought assurances from the Siamese king that they would not intervene in the Burmese affairs and to surrender rebel leadership. But the Siamese king refused Burmese demands and prepared for war. In December 1759, Alaungpaya's 40,000-strong Burmese army left Martaban to invade Siam via
Tenasserim. His second son,
Hsinbyushin was his deputy. The Burmese occupied the town of Tenasserim, moved eastward over the
Tenasserim Hills to the shore of the
Gulf of Siam, turned north and captured the coastal towns,
Kuwi,
Pran Buri, and
Phetchaburi. Siamese resistance stiffened as the Burmese approached the capital of
Ayutthaya, but nonetheless, they were driven back with heavy losses in men, guns, and ammunition. but Burmese sources state clearly that he fell ill, and given the inglorious nature of death by illness it is unlikely they were trying to hide the truth. The Burmese began their retreat on 17 April 1760 (3rd waxing of Kason 1122 ME). Only
Minkhaung Nawrahta's 6000 men and 500
Cassay cavalrymen remained as the
rearguard, successfully fending off Siamese attacks along the route of retreat. ==Death==