William Pitt the Younger
Haiti

In 1793, Pitt decided to take advantage of the Haitian Revolution to seize St. Domingue, the richest French colony in the world, believing this would strike a great blow at France while bringing St. Domingue into the British Empire and ensuring that the slaves in the British West Indies would not be inspired to revolt likewise. Many of those who owned slave plantations in the British West Indies had been greatly alarmed by the revolution, which began in 1791, and they were strongly pressing Pitt to restore slavery in St. Domingue, lest their own slaves be inspired to seek freedom. Henry Dundas, 1st Viscount Melville, who was Pitt's Secretary of State for War, instructed Sir Adam Williamson, the lieutenant-governor of Jamaica, to sign an agreement with representatives of the French colonists that promised to restore the ancien regime, slavery, and discrimination against mixed-race colonists, a move that drew criticism from abolitionists William Wilberforce and Thomas Clarkson.

The British landed in St. Domingue on 20 September 1793, stating they had come to protect the white population from the blacks, and were able to seize some coastal enclaves. The fact that the British had come to restore slavery in St. Domingue inspired ferocious resistance from the Haitians, who had no desire to be forced into chains again. The heavy death toll caused by yellow fever, the much dreaded "black vomit", made conquering St. Domingue impossible, but an undeterred Pitt launched what he called the "great push" in 1795, sending out an even larger British expedition.

In November 1795, some 218 ships left Portsmouth for St. Domingue. After the failure of the Quiberon expedition earlier in 1795, when the British landed a force of French royalists on the coast of France who were annihilated by the forces of the republic, Pitt had decided it was crucial for Britain to have St. Domingue, no matter what the cost in lives and money, to improve Britain's negotiating hand when it came time to make peace with the French republic. The British historian Michael Duffy argued that since Pitt committed far more manpower and money to the Caribbean expeditions, especially the one to St. Domingue, than he ever did to Europe in the years 1793–1798, it is proper to view the West Indies as Britain's main theatre of war and Europe as more of a sideshow. By 1795, 50% of the British Army was deployed in the West Indies (with the largest contingent in St. Domingue), whereas the rest of the British Army was divided among Britain, Europe, India, and North America.

As the British death toll, largely caused by yellow fever, continued to climb, Pitt was criticised in the House of Commons. Several MPs suggested it might be better to abandon the expedition, but Pitt insisted that Britain had given its word of honour that it would protect the French planters from their former slaves, and the expedition to St. Domingue could not be abandoned. The British attempt to conquer St. Domingue in 1793 ended in disaster; the British pulled out on 31 August 1798 after having spent 4 million pounds (roughly £ 500 million in 2023) and having lost about 100,000 men—dead or crippled for life, mostly from disease—over the preceding five years. The British historian Sir John William Fortescue wrote that Pitt and his cabinet had tried to destroy French power "in these pestilent islands... only to discover, when it was too late, that they practically destroyed the British army". Fortescue concluded that Pitt's attempt to add St. Domingue to the British empire had killed off most of the British army, cost the British treasury a fortune and weakened British influence in Europe, making British power "fettered, numbered and paralysed", all for nothing.
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