Battle of Algoa Bay

Battle of Port Louis
Part of the French Revolutionary Wars
Combat de la Preneuse, Auguste Mayer, Musée Quesnel Morinière
Date 11 December 1799 Location Off Port Louis, Île de France Result British victory
Belligerents
Great Britain	French Republic
Commanders and leaders
Captain John Osborn	Captain Jean-Matthieu-Adrien Lhermitte
Strength
Ship of the line HMS Tremendous, fourth rate HMS Adamant	Frigate Preneuse
Casualties and losses
	Preneuse destroyed

The Battle of Port Louis was a minor naval engagement of the French Revolutionary Wars, fought on 11 December 1799 at the mouth of the Tombeau River near Port Louis on the French Indian Ocean island of Île de France, later known as Mauritius. Preneuse had originally been part of a powerful squadron of six frigates sent to the Indian Ocean in 1796 under the command of Contre-amiral Pierre César Charles de Sercey, but the squadron dispersed in 1798 and by the summer of 1799 Preneuse was the only significant French warship remaining in the region. The battle was the culmination of a three-month raiding cruise by the 40-gun French Navy frigate Preneuse, commanded by Captain Jean-Matthieu-Adrien Lhermitte. Ordered to raid British commerce in the Mozambique Channel, Lhermitte's cruise had been eventful, with an inconclusive encounter with a squadron of small British warships in Algoa Bay on 20 September and an engagement with the 50-gun HMS Jupiter during heavy weather on 9–11 October.

Returning to Île de France in December, Lhermitte steered for Port Louis but was intercepted by the British blockade squadron, comprising the 74-gun ship of the line HMS Tremendous and the 50-gun HMS Adamant. Unable to reach safety, Lhermitte evaded pursuit long enough to drive Preneuse onto a beach at the mouth of the Tombeau. After a brief exchange of fire the wrecked frigate was surrendered and British boarding parties in ship's boats rowed inshore to Preneuse, removed the survivors and burnt the remains. Watching from the shore as the last of his command burned on the beach, Sercey subsequently retired from military service.

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