Nuestra Señora de la Piedad

On 13 March 1797, Pengelley and Viper were about seven leagues north-west from Alboran, as they were returning to Gibraltar from Algiers when she sighted a Spanish privateer. As they approached, Pengelley fired a gun, which the Spaniard answered, first with a shot and then a broadside after he hove to. At half-past one Viper closed alongside the brig. The ensuing action lasted until 3:10 p.m., when the Spaniard hauled down his colours. During the action, the Spanish several times attempted to start fires on Viper by throwing over flasks filled with powder and sulphur.

The Spanish brig was Nuestra Señora de la Piedad. She was armed with six 4-pounder and four 6-pounder guns, and eight swivels, and had a crew of 42 men. The two vessels were thus relatively evenly matched. Nuestra Señora de la Piedad had one man killed and seven dangerously wounded, one of whom died; Viper suffered no casualties.^[15]

In 1799, Viper visited Sierra Leone, leaving on 1 April in company with Triton,^[16] and returning on 3 August. Pengelly reported that he had run down the coast and found the settlements very healthy.^[17]

Viper and Furet

On 26 December 1799, at 10:15 a.m. Viper was seven or eight leagues south of the Dodman, serving as escort to a convoy of three merchant vessels, a sloop, a brig, and a three-masted ship,^[18] when she sighted a suspicious vessel sailing towards her. Realising that the approaching vessel was an enemy, Pengelley sailed towards him. The French captain thought that Viper was maneuvering with such timidity that he could prevail.^[18] The engagement commenced at 10:45 a.m. The close action continued for three-quarters of an hour, when casualties on board the privateer caused the majority of the crew of the privateer to panic, forcing the captain of the enemy vessel to take flight.^[18] A running fight of an hour and a half ensued as Viper pursued her opponent. Eventually, Viper got close enough to be able to pour two broadsides into her enemy, who then struck his colours.^[19]

The enemy turned out to be the French privateer Furet, of fourteen 4-pounder guns and 57 men under the command of Citizen Louis Bouvet. Furet was two days out of Saint Malo and had earlier that day put a seven-man prize crew aboard a vessel that she had taken. In the battle with Viper, Furet had four men killed and her first and second captains and six men wounded, four dangerously;^{[lower-alpha 2]} Viper had one man wounded, with Pengelley also being slightly injured. Because both captor and captive were much damaged in their sails and rigging, Pengelley put into Falmouth, from where he intended to sail to Plymouth as soon as he could.^[19] The French wounded were transferred to the hospital of Mill Prison. Some weeks later the British paroled Bouvet and sent him in the cartel John to Morlaix.^[18]

This was a sufficiently notable single-ship action that in 1847, the Admiralty awarded the Naval General Service Medal with clasp "Viper 26 Decr. 1799" to the one surviving claimant from the action.^[20]

Morbihan

In March 1800 Lieutenant Matthew Forester replaced Pengelley.^[3] Viper joined Sir Edward Pellew's squadron at Morbihan on 5 June,. Then on 6 June, the boats of the squadron attacked Morbihan itself. The British were able to cut out five brigs, two sloops, and two gun vessels, and to capture 100 prisoners. The British burned the corvette brig Insolente, of 18 guns, as well as several small craft. They also destroyed the guns there and blew up the magazine.^[21] On 27 June Viper was in company with Excellent when they recaptured Lord Duncan.^[22]

Because Viper was part of Admiral Sir John Borlase Warren's squadron, her crew was entitled to share in the proceeds from the squadron's recapture of Lancaster on 28 June.^[23] Similarly, Viper shared in the proceeds of Vigilant, Menais, Industry (salvage for recapture), wreck of a vessel sold, Insolent, and Ann.^[23] Lastly, she shared in the squadron's capture of the French privateer Guêppe on 30 August.^{[24][lower-alpha 3]}

Cerbère

At some point in mid-1800, Lieutenant Jeremiah Coghlan (acting) assumed command. In July 1800, Coghlan, who had been watching Port-Louis, Morbihan, proposed to Pellew that he, Coghlan, take some boats into the harbour to cut out one of the French vessels there. Pellew acceded to the proposal and gave Coghlan a cutter from Impetueux, Midshipman Silas H. Paddon, and 12 men. Coghlan added in six men and a boat from Viper, and a boat from Amethyst. On 29 July the boats went into the port after dark, targeting a brig. During the run-up to the attack the boats from Viper and Amethyst fell behind, but Coghlan in the cutter persisted.^[25]

Coghlan's initial attempt at boarding failed and he himself received a pike wound in the thigh. The French repelled a second attempt too. Finally, the British succeeded in boarding, killing and wounding a large number of the French brig's crew, and taking control. The two laggard boats came up and the British then brought the brig out of the harbour and back to the fleet.

The brig was Cerbère, of three 24-pounder and four 6-pounder guns, with a crew of 87 men, 16 of them soldiers, all under the command of lieutenant de vaisseau Menagé. The attack cost the British one man killed (a seaman from Viper), and eight men wounded, including Coghlan and Paddon. The French lost five men killed and 21 wounded, including all their officers; one of the wounded men died shortly thereafter.^[25]

The Royal Navy took Cerbère into service under her existing name. Pellew's fleet waived their right to any prize money as a gesture of admiration for the feat.^[25] Pellew also recommended Coghlan's promotion to Lieutenant, which followed, though Coghlan had not served the requisite time in grade.^[26] Earl St. Vincent personally gave Coghlan a sword worth 100 guineas,^[26] in order to "prevent the city, or any body of merchants, from making him a present of the same sort".^[27] In 1847 the Admiralty awarded the Naval General Service Medal with clasp, "29 July Boat Service 1800" to the four then surviving claimants from the action.

On 1 November Viper recaptured Diamond.^[28]

On 1 February 1801, Viper captured Mont Blanc.^[29] Mont Blanc was advertised for sale in April. She was a schooner of 10869⁄94 and had been captured as she was sailing from Cayenne to Lorient. Her cargo was for sale too, including 19 elephants' teeth, as were six brass guns and four iron guns.^[30]

Next, Viper and Brilliant captured Petit Felix on the 15th of the month.^[29] Petit Felix was a new Chasse-marée of 5310⁄94 tons (bm). Her cargo, for exportation, consisted of brandy, red and white wine, castile soap, tar, twigs, and whisk brooms.^[30]

Also on 15 February Viper captured Jupiter.^[31]

On 1 April, Viper was in company with Atalante when they encountered four French privateers off Land's End. Three of the privateers escaped. Nevertheless, Atalante pursued one and after a chase of 17 hours captured her. She turned out to be the brig Héros, of Saint Malo. She was armed with 14 guns and had a crew of 73 men under the command of her master, Renne Crosse.^[32]

Viper shared in the proceeds of the capture of Adelaide and a brig on 8 August as part of Pellew's squadron.^[33] Viper was then paid off in October 1801.