Unicorn entered service in 1794 under the command of Captain William Cayley, who was followed in 1795 by Captain
Thomas Williams. Under Williams,
Unicorn served in the
Western Approaches, operating from
Cork. On 31 May,
Unicorn, and shared in the capture of the Dutch schooner
Mary, Captain Pierce, master. On 28 August 1795,
Unicorn was in company with and , when
Unicorn captured the Dutch
East Indiaman Cromhout or
Crumhout. Then
Unicorn parted company with the rest of the squadron and after a chase of 13 hours captured the Dutch
brig Komeet (or
Comet), which was under the command of Captain-Lieutenant Mynheer Claris.
Comet was only four years old, in excellent condition, and armed with 18 English 9-pounder guns. She was sailing from the Cape of Good Hope to the Texel and was provisioned with water and food for 110 men for a nine-month cruise. The Royal Navy took her into service as
HMS Comeet.
Crumhout,
Komeet, and a third vessel, the southern whale ship
Horstfelder, that the British also captured, were part of a convoy of nine East Indiamen and two naval vessels,
Komeet and
Scipio.
Scipio escorted the remaining Indiamen into Norwegian waters, which they reached on 22 September.
Scipio and three of the Indiamen reached
Trondheim on 6 October. The remaining Indiamen went to
Bergen and
Ålesund. On 10 April 1796,
Unicorn recaptured the brig
Thames while in company with
Penguin and the
hired armed cutter Fox.
Unicorn,
Fox, ,
Diana and
Seahorse, were in company when
Dryad captured the French cutter
Abeille. by HMS
Unicorn, by
Nicholas Pocock On 7 June,
Unicorn and
Santa Margarita captured a large ship flying Swedish colours and carrying Dutch goods from Surinam, which turned out to be the
Gustavus Adolphus. The commander of the prize crew, a lieutenant from
Unicorn, advised Admiral Sir
Robert Kingsmill, commander in chief of the Cork station, that when he had last seen
Unicorn and
Santa Margarita they were chasing three French vessels, the frigates
Tamise and , and the corvette
Legere. In the
action of 8 June 1796,
Unicorn captured the 44-gun
Tribune. Before
Unicorn could bring
Tribune to close action the two vessels engaged in a ten-hour-long running fight. The actual close engagement lasted 35 minutes before
Tribune struck. She was under the command of Commodore John Moulston and had lost 37 men killed of her crew of 337 men, as well as 15 wounded. (Moulston, who was wounded in the action, was an American who had served in the French Navy for 16 years.)
Unicorn had no losses. •
Eliza (22 September); •
Orion (23 September); •
Christian the Seventh (24 September): •
Whilhemsberg (1 October); and •
Freiheden (4 October). On 21 October
Unicorn captured the 6-gun privateer
Enterprise in the Irish Sea.
Enterprise had a crew of 40 men and was 28 days out of
Brest. During her cruise she had captured a Portuguese ship, two English brigs, and a sloop. In December,
Unicorn was one of the few British ships able to respond to the French effort to invade Ireland during the
Expédition d'Irlande. On 7 January 1797,
Unicorn was able to capture the troopship with and and pursue the French flagship in the closing days of the campaign. Eleven days later
Unicorn,
Doris and
Druid captured the privateer
Eclair, of 18 guns and a crew of 120 men, in the Channel.
Unicorn then rejoined the British fleet. In August,
Unicorn was in company with when they recaptured the
Somerset at Cove, near Cork. In March 1797 command passed to Captain
James Young and then to Captain Phillip Wilkinson in April 1799.
Unicorn captured a French brig in March 1799. On 9 June 1799
Unicorn and the hired armed cutter
Constitution captured the French brig
St. Antoine. On 10 June, two of
Unicorns boats, together with two each from , and , all of Sir
John Borlase Warren's squadron, captured the gunboat
Nochette, two other armed vessels, and eight transports carrying supplies for the fleet at
Brest.
Nochette was armed with two 24-pounder guns. The two other armed vessels were
chasse-marée armed with eight and six guns. The transports consisted of two brigs, two sloops, and four chasse-marée, which were carrying wine, brandy, flour and peas. In addition, the crews of 20 French vessels ran their vessels ashore, where many were probably wrecked. The British suffered four men wounded, but none were from
Unicorn.
Unicorn was short of water so Admiral
St. Vincent ordered her to escort the prizes back to Plymouth and then immediately return to her station.
Unicorn arrived at Plymouth on 18 June with ten vessels, one having foundered on the way. (The crew was saved.) She sailed for Brest on 27 June. Next,
Unicorn participated in the attempt on the Spanish squadron in
Aix Roads on 2 July. On 6 January 1800
Unicorn was among the five vessels that shared in the capture of the French brig
Ursule (or
Huzelle). On 7 January, the French armed ship
Huzelle came into Plymouth. She had been carrying passengers from Cayenne, including women and children, when captured her. On her way in to a British port, the French privateer
Providence, of 14 guns and 152 men, had recaptured her and sent her to Bordeaux. However, before she got there,
Unicorn and recaptured her in turn and sent her into Plymouth.
Huzelle was low on provision with the result that a five-year-old child died while she was in Plymouth Sound; as she anchored at Catwater, M.P. Symonds, the broker for the prize, sent on board plenty of fresh provisions. Among
Huzelles passengers were a Colonel Molonson of Invalids, and a naturalist, M. Burnelle, with a cabinet of curiosities for the French National Museum at Paris. In June
Unicorn was still with Warren's squadron off the Atlantic coast of France. She therefore shared in the capture on 11 June of ten merchant vessels: the brig
Rosalie,
Baure Paire, the sloop
Rosalie,
Bonne Nouvelle,
Oiseau,
Felicite,
Nochelle,
St. Claire,
Henrietta, and
Maree Francaise.
Unicorn was also among the five ships that shared in the proceeds of the capture of the French privateer
Rancune, taken on 27 September.
Unicorn shared in some of these prizes by virtue of being part of Admiral Keats' squadron. She also shared in the captures of
Girone (28 July),
Revanche (28 July),
Alerte (1 July),
Joseph (3 August),
Vivo (30 September), and
Magicienne (16 October).
Unicorn shared with four other vessels in the capture of
Union on 14 August. On 15 August
Unicorn recaptured
Petit Bastien, and four days later
Hirondelle. Command then passed to Captain Charles Wemyss in 1801. On 14 August Wemyss wrote to Admiral W. Cornwallis stating that he had only been able to capture one chasse-marée, of 40 tons, which was carrying a cargo of lime. Not only was she not worth sending in, capturing her cost
Unicorn one man killed and one man slightly wounded. Wemyss had also destroyed another chasse-marée, also of 40 tons that was carrying a cargo of corn. Captain Charles Stuart replaced Wemyss in 1802. In April and May 1803
Unicorn was placed in dock at Chatham for extensive repairs. ==Napoleonic Wars==