High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! HMS Castor was a 32-gun Amazon-class fifth rate frigate of the Royal Navy. She served during the French Revolutionary and Napoleonic Wars. The French briefly captured her during the Atlantic Campaign of May 1794 but she spent just 20 days in French hands as a British ship retook her before her prize crew could reach a French port. Castor eventually saw service in many of the theatres of the wars, spending time in the waters off the British Isles, in the Mediterranean and Atlantic, as well as the Caribbean.