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Over the spanning nearly four hundred years, the transatlantic slave trade resulted in 12.5 million Africans forcibly taken from their continent to the Americas. A devastating 1.8 million of those individuals died during the voyage, subjected to unfathomable conditions of extreme confinement, filth, and illness. Some chose to end their suffering by leaping overboard, whereas still more were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara presents two interconnected narratives. The first details a horrific incident aboard the namesake 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 dedicated work of a dazzling array of committed campaigners. Among them was Olaudah Equiano, who wrote one of the rare first-person narratives 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 trade. Financing slavery was a lucrative venture for not just the elites to the working classes. One such entrepreneur, William Gregson, saved up his earnings from his trade, invested them into the slave trade, and eventually became a prominent citizen and later mayor. Gregson financed the slave ship The William, which departed from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its hold was loaded with commodities like tobacco, firearms, knives, and various “India goods” such as chintz and cowrie shells—the shells being a common currency in the purchase of enslaved people.

The Capture of the Zorg

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

The Nightmare Passage

When Hanley arrived at Cape Coast Castle—a fortress with a notorious holding cell beneath it—he took command of the captured Zorg. He then grossly overload it with enslaved people, placed a dozen of his own crew on board, and made Luke Collingwood, a ship's surgeon of questionable 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 historical documents to bring to life the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was plagued with disaster. Dysentery swept through the vessel, followed by scurvy. The captain succumbed to sickness, lost his senses, and handed command over to Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara effectively employs eyewitness accounts to illustrate of the sheer horror. The graphic testimony of Alexander Falconbridge, a doctor who became an activist, details how the enslaved people's skin was often rubbed raw to the bone from lying on bare wood, their flesh pinched and torn between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was miles from Jamaica and dangerously short on water. The crew made the decision to throw overboard a number of the captives, who had already endured 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 deaths from disease, but they did cover cargo jettisoned out of “necessity” for the ship's safety. Over several days, the crew murdered “those Africans who would be worth less at auction”—the weak, the sick, including women and children, among them a baby born during the voyage.

Insurance and Injustice

Back in Liverpool, investor William Gregson was dissatisfied with the profit on his investment. He filed an insurance claim for £30 per lost slave—a substantial sum in today's money. The insurers declined to pay. In March 1783, Gregson sued and won a trial by jury, with his lawyers arguing that throwing the enslaved people overboard had been “necessary.”

The Spark for Abolition

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.” Just 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 saw the letter and brought it to the abolitionist Granville Sharp, who filed a motion for a new trial. At the following hearing, the events on the Zorg were examined in meticulous detail, exactly what the abolitionists had wanted.

A Sustained Campaign

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

An Enduring Impact

The question of who or what should be credited for abolition remains contentious. The Zorg's influence, however, is visibly 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 sustained mass campaign was unprecedented, serving as an affirmation 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 fill in certain lacunae in the historical record. At times, speculative passages contrast with rigorously researched accounts, giving the book a somewhat chimeric feel. A blend of narrative suspense and part historical analysis, The Zorg ultimately manages to illuminating one of history's most horrific episodes, using powerful storytelling and meticulous research to assemble a account that haunts the reader long after the final page.