Sonakanda Fort

• 1. Introduction

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  Sonakanda Fort, known locally as সোনাকান্দা দুর্গ, sits on the eastern bank of the Shitalakshya River in Narayanganj, Bangladesh. It was built to fight off river pirates rather than invading armies. No record fixes the exact year of its construction, only that a seventeenth-century Mughal governor of Bengal ordered it built alongside two sister forts. Local legend offers a very different explanation for how the fort got its name, one rooted in family honor and heartbreak rather than military strategy. What made a governor of Bengal build not one fort here but three? What did his engineers design into these walls to make them effective against boats loaded with raiders? And how much of the fort's name really comes from stone and cannon, and how much from a story passed down for generations?

• 2. Mir Jumla's Three Forts

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  In 1574 AD, the Mughal General Munim Khan defeated Daud Khan Karrani, bringing Bengal under the effective control of the Mughal Empire. That Mughal administration, historians say, pursued a progressive style of rule in Bengal and made a point of protecting its subjects from outside threats. Later, in 1660 AD, Mir Jumla II was appointed Subahdar, or governor, of the Bengal province.

  Mir Jumla II knew that pirates were running what accounts call a campaign of terror through Bengal's most important cities. To shield the capital, Dhaka, from these raiders, he decided to build three river forts around the city, and Sonakanda Fort was one of them. Archaeologists have never traced evidence of an exact date, but historians place construction's start between 1660 and 1663 AD.

  Whatever year the building work actually began, the people raising Sonakanda Fort faced one basic design problem. How do you stop a boatload of armed raiders coming up the Shitalakshya River?

• 3. Designed To Repel Pirates

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  Where the fort faces the water, its defensive walls rise 3.05 metres high and grow thicker toward the base. Specialists describe this design as a riverine redoubt fortification. Wide and narrow loopholes pierce these walls, cut specifically so defenders could fire guns and light cannons at pirate boats on the river. A raised outwork juts out along the western face, a separate structure built purely to defend against attacks from that direction. Together with the main defensive wall, these features formed the fort's first line of defense before any attacker reached the gate to the north.

  One of the fort's spherical artillery platforms includes a stairway that climbs straight up to the gun deck. This platform is the single most significant structure built into Sonakanda Fort. From that platform, cannons with a bigger calibre could aim directly at raiders working their way up the river. The platform also covered troops stationed outside the main wall. Building an artillery platform of this kind directly into a river fort was a distinctive feature of the fortifications the Mughal Empire built in Bengal.

  The platform sits ringed by two circular structures, the inner one measuring 15.70 metres across. The outer ring measures 19.35 metres across, and the whole structure rises 6.09 metres high, enclosed by its own walls. The fort as a whole is quadrangular, measuring 86.56 by 57 metres, with an octagonal bastion anchoring each of its four corners. Those corner bastions are not uniform. The two on the western wing measure 6.85 metres wide, while the pair on the eastern wing measure only 4.26 metres.

  The fort's single gate faces north, an arched entrance set inside a rectangular frame and built taller than the average height of the surrounding walls. Carved panels decorate its surface, marking the entrance as the one deliberately ornamented feature on an otherwise utilitarian structure. That same gate, according to local legend, wasn't only used to repel pirates. It also marks where a very different, and much stranger, story begins.

• 4. The Legend Behind The Name

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  According to one legend, Princess Swarnamoyee was the daughter of Kedar Roy, the ruler of Bikrampur. She was on the Shitalakshya River for a sacred bath when pirates attacked her barge and carried her off. Isa Khan Niazi, the ruler of Sonargaon, rescued her and brought her to Sonakanda Fort, then sent word asking her father to take her back. Kedar Roy refused, the story goes, because spending a night in a tent belonging to a Muslim ruler had cost her her caste. Swarnamoyee is said to have cried inside her tent at the fort for several days. Legend claims the fort's name comes from that grief: Sona echoing her name, and kanda being the Bengali word for crying.

  In a second version, Isa Khan forcefully married Sona Bibi instead, a widowed daughter of Kedar Roy. His soldiers brought her to Sonakanda Fort and kept her confined there. She cried after the marriage, and in this version, her tears are what gave the fort its name.

  Some people believe hidden tunnels once ran beneath Sonakanda Fort, linking it underground to Sonargaon and to Lalbagh Fort. No excavation has confirmed any such passage. The claim keeps alive the idea that Sonakanda Fort still holds routes no one has ever mapped.