HMS Defender was a 12-gun Courser-class gun-brig launched on 21 May 1797 and renamed HMS Defender on 7 August 1797. Designed by Sir William Rule, the Courser class was initially intended as gunboats but was reclassified as gun-brigs shortly after launch. The vessel was built at Limehouse and featured a copper-bottomed hull, indicative of her design to reduce biofouling and improve sailing efficiency. She measured approximately 168 tons burthen, with a sleek and agile build suitable for coastal and shallow-water operations. Fitted with a Schank sliding keel, HMS Defender was armed with a complement of ten 18-pounder carronades and two long 24-pounder guns, making her a formidable participant in small-scale naval engagements. Her armament and design allowed her to support various missions, including expeditions and cut-out operations. Commissioned under Lieutenant Samuel P. Leavey at Portsmouth, she underwent coppering in September 1798, enhancing her durability and performance at sea. Between August and October 1799, HMS Defender participated in an expedition to Holland, notably sharing in the capture of the Hell Hound. During this operation, she was part of a group that seized four gunboats from the Pampus in the Zuiderzee, including schuyts and a purpose-built gunboat armed with two 18-pounders. The operation was successful, with no casualties among the British crew. In February 1801, HMS Defender was refitted at Pitcher, Northfleet before sailing to the Baltic—a region of strategic importance during the period. Her service was relatively brief; she was disposed of in 1802 during the Peace of Amiens when the Royal Navy downsized its fleet. She was sold at Sheerness in September 1802, marking the end of her short but active service life. Overall, HMS Defender exemplifies the small, versatile vessels of the late 18th century Royal Navy, emphasizing agility, firepower, and adaptability in coastal and expeditionary warfare.

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