HMS Magnet was originally a French privateer named San Joseph (or San Josepho), built in 1807 in Saint-Malo under the command of François-Auguste Blanchard. As a brig-corvette, she was designed for swift cruising and was armed with 14 guns, though pierced for 18. Her crew numbered around 96 men. After her commissioning, she undertook two cruises between 1807 and early 1809, demonstrating her role as a privateer operating in the Atlantic. Her notable encounter with the British Royal Navy occurred on 12 February 1809, when HMS Undaunted, commanded by Captain Thomas James Maling, sighted and chased her in the English Channel. After a four-hour pursuit, Undaunted captured San Joseph, which was only four days out from St. Malo, provisioned for two months. The Royal Navy then took her into service, renaming her HMS Magnet, following the loss of her namesake. Refitted at Portsmouth between February and July 1809, HMS Magnet was commissioned under Commander John Smith, initially preparing for the Walcheren Campaign. She participated in the campaign, serving in the Schelde River area from 30 July to 16 August 1809, earning prize money for her involvement. Post-campaign, her service included boat operations at the entrance of the German Rivers. HMS Magnet was active in convoy and patrol duties, sharing in the capture of several vessels, including Hoffnung and Harmonia in February 1810, and recapturing Jean in March of the same year. She also captured the Frouw Heintze in October 1810. In 1811, Commander Ferdinand Moore Maurice took command, and in April 1812, the vessel sailed for South America. Her final voyage began on 14 August 1812, when she accompanied Admiral Sir John Borlase Warren's squadron en route to Halifax, Nova Scotia, aboard San Domingo. However, about two weeks into the voyage, during a severe gale, HMS Magnet parted company with the squadron and was never heard from again, presumed to have foundered with all hands. Her plans are documented by David Lyon in "The Sailing Navy List," highlighting her significance as a vessel of the early 19th-century Royal Navy.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.