How the Royal Navy’s West Africa Squadron fought to end the transatlantic slave trade

Science · Published 20 October 2026 Swipe more like this →

In short: Beginning in 1808, Britain launched a massive naval campaign to suppress the slave trade. By patrolling the African coast and negotiating complex international treaties, the West Africa Squadron liberated 150,000 people. Yet, the mission faced decades of diplomatic resistance, legal loopholes, and internal political opposition that nearly derailed the entire effort.

The British campaign originated from the 1807 decision to ban the transport of enslaved people by British vessels. To enforce this, the Royal Navy established the West Africa Squadron, initially deploying two ships to the African coast. Over time, this force expanded significantly; by the mid-19th century, it comprised approximately 25 vessels and 3,000 personnel, including 1,000 local sailors recruited from the Liberian Kru people to assist with coastal patrols.

Enforcement was fraught with legal challenges. Because the British sought to operate within international law, they relied on vice admiralty courts and Courts of Mixed Commission to try captured slavers. However, these courts were often undermined by the reluctance of other nations to cooperate. For years, naval officers were hampered by the lack of an 'equipment clause,' meaning they could only seize ships if enslaved people were physically on board at the time of the search. This flaw was not addressed until the 1830s, leading to immense frustration among naval commanders.

Diplomatic friction remained a constant hurdle. The United States, protective of its maritime sovereignty, frequently refused to grant the Royal Navy the right to search American-flagged vessels, which slavers often used as a cover. It was not until the 1862 Lyons–Seward Treaty, signed during the American Civil War, that the US granted Britain full authority to intercept American ships. Meanwhile, domestic opposition in Britain grew as critics argued that the naval blockade was too costly and damaging to free trade. Despite these obstacles, the squadron’s persistence—and the eventual use of force against defiant nations like Brazil—proved instrumental in extinguishing the transatlantic slave trade by the late 1860s.

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