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Over the course of nearly four hundred years, the Atlantic slave trafficking system saw 12.5 million Africans trafficked from their continent to the Americas. A staggering 1.8 million of those souls died during the Middle Passage, enduring unfathomable conditions of extreme confinement, squalor, and illness. Some took their own lives by throwing themselves overboard, whereas others were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first chronicles a harrowing incident aboard the eponymous slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story examines how this atrocity played a pivotal role in the ending of the Atlantic slave trade in 1807, thanks largely by the relentless efforts of a coalition of abolitionist activists. Among them was Olaudah Equiano, who authored one of the rare first-person accounts of the Middle Passage, describing it as “a scene of horror almost inconceivable”.

Liverpool's Central Role

The tale begins in Liverpool, a port city that at the height of its economic power was responsible for 40% of Europe's slave trafficking. Financing slavery was a lucrative venture for not just the elites to the common people. One such investor, William Gregson, saved up his earnings from rope-making, ploughed them into the slave trade, and rose to become a prominent citizen and later mayor. Gregson financed the slave ship The William, which set sail from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its cargo was loaded with trade goods like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the shells being a common currency in the acquisition of enslaved people.

A Ship Seized

Concurrently, a Dutch slave vessel named the Zorg (later anglicized by the British as the Zong) had departed the Netherlands. With Britain declaring war on the Dutch in late 1780, the Royal Navy gave British ships authority to seize Dutch property at sea—a de facto sanctioning of piracy. The Zorg was soon taken by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, on a slaving expedition, took aboard a disgraced British governor named Robert Stubbs, who had been removed for graft.

The Nightmare Passage

When Hanley arrived at Cape Coast Castle—a stronghold with a vast holding cell beneath it—he assumed control of the captured Zorg. He then severely overcrowd it with captives, put a dozen of his own crew on board, and appointed Luke Collingwood, a ship's surgeon of dubious nautical skill, its captain. In August 1781, the Zorg finally left Accra carrying 442 captives, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara excels in using contemporaneous sources to bring to life the general hell of being trafficked on a slave ship.

The Zorg's journey was fraught with calamity. "The flux" swept through the vessel, followed by scurvy. The captain succumbed to sickness, became delirious, and handed command over to Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara masterfully utilizes eyewitness accounts to paint a picture of the sheer horror. The powerful testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, details how the captives' skin was often rubbed raw to the bone from being packed on bare wood, their flesh pinched and torn between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was still far from Jamaica and dangerously short on water. The crew made the decision to jettison a number of the enslaved Africans, who had already suffered through months of obscene conditions below deck. This monstrous act was not motivated by ensuring survival—the Africans had pleaded to be allowed to live, even without water rations—but by pure economic greed. Maritime insurance policies did not cover losses from natural causes, but they would pay for cargo jettisoned out of “necessity” for the ship's safety. Over several days, the crew drowned “those Africans who would be worth less at auction”—the infirm, the sick, along with women and children, among them a baby born during the voyage.

Insurance and Injustice

Back in Liverpool, investor William Gregson was unhappy about the financial return on his investment. He filed an insurance claim for £30 per drowned captive—a substantial sum in today's money. The insurers refused to pay. In March 1783, Gregson took them to court and was awarded a trial by jury, with his lawyers claiming that throwing the enslaved people overboard had been “necessary.”

Catalyzing the Movement

According to Kara, “there is a direct line of causality between the public exposure of the Zorg murders and the first movement to abolish slavery in England.” Merely twelve days after the trial, an anonymous letter appeared in a prominent English newspaper. The author, who claimed to have attended the court proceedings, made a powerful case against slavery, citing the Zorg case as a key illustration of its brutality. Olaudah Equiano read the letter and took it to the abolitionist Granville Sharp, who petitioned for a new trial. At the subsequent hearing, the events on the Zorg were examined in forensic detail, exactly what the abolitionists had hoped for.

A Sustained Campaign

In the spring of 1787, the initial group of the Society for Effecting the Abolition of the Slave Trade convened. Over the subsequent years, they petitioned, orated, organized campaigns, and gathered evidence on the realities of the slave trade. “Their efforts,” Kara writes, “would lay a blueprint for the pursuit of social justice.” After years of struggles, the Act for the Abolition of the Slave Trade was finally passed in 1807.

An Enduring Impact

The debate over who or what should be credited for abolition is contentious. The Zorg's influence, however, is powerfully evident in J.M.W. Turner's famous painting, The Slave Ship, which was based on the events of 1781. While slavery has been widespread in human history, its abolition following a prolonged public movement was historic, serving as an testament to the power of persistent activism, the pen, and unwavering determination.

The Author's Approach

In contrast to his other work—such as the acclaimed Cobalt Red—Kara has had to address certain lacunae in the available documentation. Consequently, imaginative flourishes contrast with scrupulously factual accounts, giving the book a somewhat chimeric feel. A blend of narrative suspense and part serious nonfiction, The Zorg nevertheless succeeds in shedding light on one of history's darkest chapters, using powerful storytelling and documented fact to assemble a portrait that stays with the reader well after the final page.