 His first act after taking reign was the dispatch of an army against Mansur Khan, which succeeded in recovering Gauhati in August 1682 after a decisive encounter at Itakhuli.The Ahoms expelled Mansur Khan from Gauhati and re-established their possession over the territories extending up to the river Manaha (Manas).Thus, Manaha (river Manas) became once more the western boundary of Assam and it remained as such till the occupation of the western Assam by the British in the year 1824.