Bay series: Episode Three:

Commerce, conquest, and the call of the Monsoon

"He who controls the sea controls everything."

—Thucydides, History of the Peloponnesian War, c. 400 BCE

From rivers to the sea

The rivers of Bengal, as seen in the last episode, were never just waters flowing toward the Bay—they were vital lifelines of civilisation, shaping the delta's soil, supporting communities, and guiding the rhythm of daily life.

However, as these rivers widened into estuaries and discharged into the Bay of Bengal, they revealed a new reality: the sea as a stage for power, diplomacy, and enterprise. While Episode Two emphasised rivers as connectors to the broader world, Episode Three begins with a lesson Thucydides stated millennia ago: mastery of the sea was mastery of fate.

This principle was recognised far beyond Athens and Sparta. Bengal's rulers and sailors knew that authority was incomplete without control of the waters. From the Palas and Senas to the Cholas and Mughals, kings and seafarers created a maritime legacy whose influence still resonates across the Bay today (Amrith 2013; van Schendel 2009).

The Palas: Inland kings with a maritime vision

The Pala dynasty (8th–12th centuries), known for its Buddhist monasteries and inland capitals, might seem at first glance to be landlocked. However, archaeological evidence—such as dock remains, pottery, and coins—and textual references show active engagement with maritime trade (Chakrabarti 2005).

Willem van Schendel emphasises that ports like Chittagong served as routes connecting Bengal with Burma, Arakan, and Southeast Asia. Salt, rice, timber, and luxury goods moved through these waters, illustrating that the Palas' maritime perspective extended beyond practical trade: the Bay of Bengal was viewed as a pathway of opportunity. By seeing the sea not as a boundary but as a link, the Palas laid the foundation for centuries of Bengali maritime activity.

The Cholas: Rivals and collaborators across the Bay

While the Palas approached the sea cautiously, the Cholas of South India (9th–13th centuries) pursued it with extensive ambition. Chola naval expeditions reached Sri Lanka, the Maldives, and Southeast Asia, often visiting ports in Bengal. Inscriptions and copper-plate grants record the arrival of Tamil merchants, who traded in pepper, textiles, and artisans (Amrith 2013).

Sunil Amrith depicts the Bay as a hub of mobility, where pilgrims, artisans, and sailors crossed political and cultural borders, forming a network of exchange. The Cholas were both rivals and allies, showing that maritime power was about connection and diplomacy as much as dominance and control.

Barbara Metcalf highlights that religion, culture, and technology also travelled along these maritime networks, not just goods.

The Senas: Fragility at the water's edge

The Sena dynasty (11th–12th centuries) show how fragile maritime power can be. Even though they controlled key ports and river routes, their influence was vulnerable to environmental and political shifts. River silting, changing trade routes, and rival dynasties could quickly undermine their authority.

JC Sharman stresses that pre-modern empires "rarely succeed through sheer force; their survival depends on recognising and exploiting the inherent fragility of networks, alliances, and geographic chokepoints". The decline of the Senas under Muslim invasions illustrates this idea: maritime and river networks, once reliable channels of commerce and power, could be disrupted or taken over by rivals. Bengal's history shows Sharman's point that influence often stems from adaptive engagement rather than brute strength (Sharman 2019).

The Mughals: Bengal as the eastern jewel

By the 16th century, Bengal had become the crown jewel of the Mughal Empire. Satgaon, Chittagong, and Dhaka's riverine hinterlands thrived as centres of commerce. Mughal governors managed shipbuilding, kept rivers navigable, and taxed trade, ensuring the "king and sailor" dynamic reached its peak.

Richard M Eaton emphasises that Bengal's wealth—encompassing muslin, silk, and saltpeter—traveled to Cairo, Amsterdam, and Canton, connecting the delta to global networks. Persian, Arab, Portuguese, and Dutch merchants gathered at Bengal's ports.

Lawrence Freedman reminds us that strategy, whether in war or business, involves seizing opportunities while recognising limitations. Mughal rulers understood that land and sea power were interconnected: wealth moved along rivers as much as on roads.

Beyond kings: Sailors, merchants, and the human experience

Kings alone did not animate this maritime world. Fishermen guided pilots through shifting channels; Muslim merchants spread Islam to Southeast Asia; Sufi missionaries travelled on dhows to reach distant shores. These individuals wove the Bay into a vibrant tapestry of commerce, culture, and belief (Metcalf 2012).

Ports were cosmopolitan microcosms: Arabic inscriptions at Chittagong, Buddhist shrines along coastal routes, and Hindu temples dotting towns are all testaments to cultural diversity. Sailors carried goods, stories, languages, and songs, enriching Bengal's social fabric. In this sense, the Bay was both a stage and an actor, shaping lives and ideas as much as it received them.

Risk, strategy, and environmental mastery

Maritime power faced ongoing threats. Monsoon storms could sink fleets overnight; pirates endangered trade and lives; and conflicts between the Arakanese and Portuguese could turn commerce into warfare. For Bengal's rulers and sailors, strategy involved living with uncertainty, adapting to tides, winds, and human rivals (Freedman 2013).

Sharman notes that maritime networks influence not just through fleet size but also by understanding structural vulnerabilities in geography and political alignments (Sharman 2019). Bengal's kings demonstrated this adaptive intelligence. Their success depended on controlling rivers, tides, and alliances—recognising that dominance was never absolute.

Empires of the Weak: Lessons for Bengal

Sharman's Empires of the Weak presents early modern statecraft as navigating fragility rather than relying on brute force. Bengal's empires demonstrate this concept centuries before European powers arrived. By understanding rivers, tides, and coastal networks, kings and sailors held significant influence over the Bay of Bengal. Adaptation, diplomacy, and maritime literacy became essential parts of power.

Sharman further emphasizes that small states, by mastering local chokepoints and understanding complex regional networks, can gain strategic leverage beyond their size (Sharman 2019). Bengal's rulers did exactly this, showcasing a model of maritime statecraft that balanced risk, resilience, and opportunity.

Continuities, transitions, and leading into Episode Four

By the 18th century, European powers—Portuguese, Dutch, French, British—entered Bengal's waters not to explore but to become part of established networks. However, the core principles remained the same: navigating fragility, strategic adaptation, and forming alliances to influence maritime power.

As rivers carried Pala monks' manuscripts, Chola fleets' pepper, and Mughal merchants' muslin into the Bay, so did monsoon and trade winds spread Bengal's influence outward. Episode Four—Monsoon and trade winds: The Arab and Southeast Asian connections—will explore these historical winds, illustrating how Bengal became a vital hub in a maritime world stretching from the Red Sea to the South China Sea.


Writer: Commodore Syed Misbah Uddin Ahmad, (C), NUP, ndc, afwc, psc, BN (retd), Director General, Bangladesh Institute of Maritime Research and Development (BIMRAD). Email: misbah28686@gmail.com