The Burmese invasion of Assam denotes the period between 1817 and 1826 when the Ahom Kingdom in Assam was invaded three times by the Burmese and the kingdom briefly came under the control of Burmese rulers (1821–1825). This period, called the manor din by the Assamese and Chahi-Taret Khuntakpa (seven years of devastation) in Manipuri, is remembered with horror. It was the climactic period of the 600-year old Ahom kingdom. The sharp drop in population due both to depredations as well emigrations left the erstwhile kingdom in shambles. The British, who were earlier reluctant to colonise Assam, came into direct contact with a belligerent Burmese occupying force; and following the First Anglo-Burmese War annexed not just the Ahom kingdom but also Burma.