Similarly, "Viper" shared in the proceeds of "Vigilant", "Menais", "Industry" (salvage for recapture), wreck of a vessel sold, "Insolent", and "Ann". Lastly, she shared in the squadron's capture of the French privateer "Guêppe" on 30 August. 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 . 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. 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. 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. Pellew also recommended Coghlan's promotion to Lieutenant, which followed, though Coghlan had not served the requisite time in grade. Earl St. Vincent personally gave Coghlan a sword worth 100 guineas, in order to "prevent the city, or any body of merchants, from making him a present of the same sort".