Bujurg Umid Khan eldest son of Mughal Subahdar shaista khan and conqueror of Chittagong. During his father's administration, he led several expeditions for the expansion of the Mughal territory in Bengal. His most significant achievement, however, was the capture of Chittagong by expelling the Arakanese from the region.

Chittagong was under Arakan and Sandwip was under portuguese occupation ever since the rule of the Afghans. The Arakanese and Portuguese pirates sometimes penetrated deep inside Bengal. Often they abducted Bengali men, women and children to Chittagong and Sandwip and sold them as slaves to European merchants.

Shaista Khan resolved firmly to stop their criminal activities in the region. His first step was to capture Sandwip. Dilwar Khan, a renegade Mughal naval commander had seized Sandwip from the Arakanese, who earlier had occupied the island by ousting the Portuguese and ruled independently. In November 1665, Mughal naval commander Ibne Hussain attacked Sandwip with his fleet. Fortunately for the Mughals, this was a time when the Arakanese were in conflict with the Portuguese. The entire population of Firingibazar sought refuge in Noakhali. Shaista Khan won over the Portuguese leader and appointed him in Mughal service. Other Portuguese were also incorporated in the Mughal navy.

Assured of Portuguese help, Shaista Khan sent a contingent of army under Bujurg Umid Khan, who started from Dhaka on 24 December 1665. Naval commander Ibne Hussain advanced with a fleet of 288 war boats and was joined by another 40 boats of the Portuguese. On 14 January 1666 the Mughal contingent crossed the Feni river and entered the Arakanese territory. The Arakanese attacked the Mughals when the latter had passed Kumira and reached the Kathalia canal. On 23 January the first naval battle took place and the Arakanese were pushed back to the Karnafuli river.

In the second battle, several Arakanese boats were sunk and the Mughals seized the rest, a total of 135. On 26 January Bujurg Umid Khan triumphantly entered Chittagong and was joyously received by the local people. The Mughals held 2000 Arakanese as prisoners of war and freed thousands of enslaved Bengali peasants. Chittagong was incorporated into the Mughal realm. It was named 'Islamabad' by a decree of Emperor aurangzeb and a faujdar was appointed there. [AKM Yakub Hossain]