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The Burmese–Siamese War (1775–1776) (ယိုးဒယား-မြန်မာစစ် (၁၇၇၅–၁၇၇၆); สงครามพม่า-สยาม (พ.ศ. 2318–2319)) was the military conflict between the Konbaung Dynasty of Burma (Myanmar) and the Thonburi Kingdom of Siam (Thailand). It resulted in the first-ever military defeat of Konbaung Burma, and the end of Burma's over two-century control of southern Lan Na (Chiang Mai down to Lampang). Siam's victory signaled the ascent of Siamese power and the decline of Burmese power in the region.

Siam successfully forced Burmese vassal states of Vientiane and Luang Phrabang to switch sides in 1778.