There were three Burmese invasions of Assam between 1817 and 1826, during which time the Kingdom of Assam came under the control of Burma from 1821 to 1825. Locally, this period, called the manor din by the people of Assam, is remembered with horror. The sharp drop in population due both to depredations as well emigrations left the erstwhile kingdom in shambles. It was the climactic period of the Ahom kingdom. The British, who were earlier reluctant to colonise Assam, came into direct contact with a belligerent Burmese occupying force. Following the First Anglo-Burmese War they annexed Assam and took Manipur as a subsidiary state.

The Ahom kingdom was a late medieval kingdom in the Brahmaputra Valley that retained its independence for nearly 600 years despite encountering Mughal expansion in Northeast India. Established by Sukaphaa, a Tai prince from Mong Mao, it began as a mong in the upper reaches of the Brahmaputra based on wet rice agriculture. It expanded suddenly under Suhungmung in the 16th century and became multi-ethnic in character, casting a profound effect on the political and social life of the entire Brahmaputra valley. The kingdom became weaker with the rise of the Moamoria rebellion, and subsequently fell to repeated Burmese invasions of Assam. With the defeat of the Burmese after the First Anglo-Burmese War and the Treaty of Yandabo in 1826, control of the kingdom passed into East India Company hands.