Burmese–Siamese War of 1568–70
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The Burmese–Siamese War (1568–1569) also known as the War of the first fall (สงครามคราวเสียกรุงครั้งที่หนึ่ง) was a military conflict fought between the Kingdom of Ayutthaya (Siam) and the Kingdom of Burma. The war began in 1568 when Ayutthaya unsuccessfully attacked Phitsanulok, a Burmese vassal state. The event was followed by a Burmese intervention which resulted in the 2 August 1569 defeat of Ayutthaya, which became a Burmese vassal state. Burma then moved towards Lan Xang, occupying the country for a short period of time until retreating in 1570.

