Northern Front of the Burmese-Siamese War (1765-1767)
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Was the northern Front of the Burmese-Siamese War (1765-1767).
Chronology
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August 1765: The invasion began on 23 August 1765 (8th waxing of Tawthalin 1127 ME) at the height of the rainy season when the 20,000 strong northern Burmese army (20 regiments and three hundred war-boats) invaded Siam down the Wang River.
October 1765: Thihapate fought his way down the Wang, finally taking Tak and Kamphaeng Phet by the end of the rainy season.
February 1766: While the Burmese refilled their ranks, the Siamese command belatedly sent another army to retake Phitsanulok. But the Siamese army was driven back with heavy losses. It was the last major stand by the Siamese in the north. The Siamese defense collapsed afterwards. The Burmese army then moved by boat down the Nan River, taking Phichai, Phichit, Nakhon Sawan, and down the Chao Phraya, taking Ang Thong.
December 1765: Burmese military leader Thihapate captured the Burmese northern cities of Sukhothai and Phitsanulok.
January 1766: They reached the environs of Ayutthaya, making contact with Maha Nawrahta's army.