 But, Jayadhwaj Singha (1648–1663), taking advantage of the emperor Shah Jahan's illness and the war of succession, expelled the Mughals from Gauhati, and chased them down beyond the river Manaha (Manas).He also devastated the territory near Dacca and carried off to Assam a large number of Mughal subjects as captives.Aurangzeb after ascending on the throne of Delhi ordered Mir Jumla to invade Cooch Behar and Assam and re-establish Mughal prestige in eastern India.