<P> The sort of fighting and bloody killings that took place between 1812 - 19 when the Burmese kings of Mandalay tried to conquer and subdue the Shan Ahom kingdom in Assam, where the Burmese garrison commander Maha Thilawa's troops committed atrocities . However, the native marauders and hilly tribes, taking advantage of the unstable situation, disguised themselves as Burmese, looted the cities and probably killed more people than the invaders did . The population of Assam was greatly reduced by 2 / 3 and 1 / 3 of the men and boys were killed during this period . </P> <P> This event so weakened and disorganized the Shan Ahom that by 1839 the kingdom was completely annexed by the British . Before that from about 1228 - 1839 AD they maintained themselves under one Dynasty, (that of Mong Mao 568 - 1604 AD when its descendants ruled Hsenwi or Theinni in Burmese). Indeed the Shan Ahom resisted conquest by the Mughals who had conquered much of India before the British incursion. (1) Burmese translation of above interview (2) </P> <P> The Muslim Pangal of Manipur devastated and were taken as slaves by the invading Burmese armies . </P>

When did the british expel the burmese from the brahmaputra valley