[1] The fort was a part of the triangular defence strategy for the vulnerable river route, from where the pirates used to attack Dhaka.

Aurangzeb, after his accession to the throne wanted to appoint a man with high skills in naval warfare as the river-oriented Bengal was the strong hold of Shah Shuja.

Mir Jumla was aware of the pirates who used to run a campaign of terror in the important cities of Bengal.

[4] Mir Jumla II was determined to protect Dhaka and eager to develop the wealthy area Bikrampur.

The erection of the fort was intended to check the advance of the Magh and Portuguese pirates proceeding towards the Mughal capital city of Dhaka.

[5] The brick built fort comprises a wider open area surrounded by wall with bastions at the angles.

Another remarkable feature of the fort is the existence of a staircase leading to a secret room at the foot of the drum.

The staircase leads to a secret underground chamber which was the magazine or storehouse for arms and explosives.

The main entrance gate of the fort is on the north with a high rectangular bastion crowned by machicolated merlons which served as a guard room.