HMS Cynthia was a uniquely designed ship sloop launched in 1796, built by Wells & Co. of Rotherhithe. She featured a shallow draught and was equipped with three daggerboards, known as John Schank's sliding keels, which contributed to her stability and shallow water capabilities. Originally rated for 18 guns, her armament was reduced during construction to sixteen 6-pounder guns, and she carried fourteen half-pound swivels, which were likely replaced by smaller carronades later in her service. Commissioned in March 1796 under Commander Micajah Malbon, Cynthia distinguished herself through active engagement in numerous naval actions. She participated in the capture of several merchant vessels, including the American ship Favourite in April 1797, and the Spanish ship Nostra Senora Del Carmen in October 1797. Her crew also recaptured the American vessel Betty and was involved in the capture of the French merchant sloop Necessaire. Throughout 1798, Cynthia shared in the capture of a Prussian galiot and was part of the fleet that took Dutch hulks and other vessels in the New Diep, Holland, during the Anglo-Russian invasion of Holland. She shared in prize money from these captures, notably from the Dutch surrender at the Vlieter Incident. Cynthia's notable service includes an attack on fortifications at Quiberon in June 1800, where she suffered minor casualties. She also participated in the capture of the French privateer Guêpe at Vigo Bay in August 1800, an action for which her crew received the Naval General Service Medal in 1847. Later, under Commander John Dick, she took part in naval operations off Ferrol, including an unsuccessful attempt to seize the port's fortifications, and a daring cutting-out expedition at Vigo Bay, capturing the French privateer Guêpe with significant casualties on both sides. Her later service involved capturing multiple French vessels near Alexandria in 1801, including rice and coffee transports, and participating in the Egyptian campaign of 1801, for which her crew qualified for the "Egypt" clasp to the Naval General Service Medal. She also declined an offer to transport the Elgin Marbles in the early 1800s. Cynthia remained in service until 1803, after which she was laid up in ordinary at Chatham, and ultimately broken up in 1809. Her career reflects a vessel of unusual design, actively engaged in significant naval actions during the late 18th and early 19th centuries.

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