The Burmese–Siamese War ( 1785–1786 ) , known as the Nine Armies ' Wars in Siamese history because the Burmese came in nine armies , was fought Hostile_encounter between the Konbaung dynasty of Burma and the Chakri dynasty of resurgent Siam ( Thailand ) .

In early 1785 , King Bodawpaya of Konbaung dynasty sent Sending an expedition force to take Conquering Jung Ceylon ( Phuket ) to prevent Preventing_or_letting foreign arms shipments to Siam but the invasion force was driven Motion back .

The defeat Earnings_and_losses that the invasion turned out to be the last full-scale invasion of Siam by Burma .

The former Sultanate of Pattani , which included Cause_to_be_included the southern Thai provinces of Pattani ( Patani ) , Yala ( Jala ) , Narathiwat ( Menara ) —also known as the three Southern Border Provinces ( SBP ) —as well as neighbouring parts of Songkhla Province ( Singgora ) , and the northeastern part of Malaysia ( Kelantan ) , was conquered Conquering by the Kingdom of Siam in 1785 and , except for Kelantan , has been governed Control by Thailand ever since .