[3] Moselle shared with Penelope and Boadicea in the proceeds of the Jonge Obyna, Smidt, master, on 13 June.

[c] After Admiral Lord Nelson defeated the French and Spanish fleets at the battle of Trafalgar on 21 October, Moselle was at the blockade of Cadiz.

On 25 November, Thunderer detained the Ragusan ship Nemesis, which was sailing from Isle de France to Leghorn, Italy, with a cargo of spice, indigo dye, and other goods.

To try to lure them out, Vice-Admiral Cuthbert Collingwood pulled his ships-of-the-line ten leagues out to sea, leaving only the frigate Hydra, under the Captain George Mundy, and Moselle in close blockade.

On 23 February a strong easterly wind drove the British off their station, which led the French commander, Captain Louis-Charles-Auguste Delamarre de Lamellerie, to seize the opportunity to escape.

On the evening of 26 February Hydra and Moselle were three leagues west of the Cadiz lighthouse when they sighted the French vessels.

Mundy began firing rockets and alarm guns to alert Collingwood, while sailing parallel to the escaping French squadron.

In the meantime, Hydra had managed to isolate the French brig from her companions, and after a two-hour chase, captured Furet.

[10] During the next six months, Lamellerie's frigate squadron cruised the Atlantic, visiting Senegal, Cayenne and the West Indies, but failed significantly to disrupt British trade.

[11] However, on 30 January Carden was still in command when Moselle captured Hope, Webber, master, which was condemned as a prize at Gibraltar.

[11] His successor as captain of Moselle was Commander George Gustavus Lennock, who returned home in February.

[21] When Lark foundered in a gale off Cape Causada (Point Palenqua), San Domingo, on 3 August, Moselle rescued three survivors.

Boys apologized to the Americans, reporting that he had been unable to make out her colours and that he thought she might be a French privateer that he was seeking.

In 1814, acting Lieutenant Joseph Hyett was severely wounded in her boats in an action against a pirate schooner at Vera Cruz.

She arrived near New Orleans on 11 January 1815, accompanying fifteen transports, ferrying the 40th Foot, a siege train of 26 artillery pieces, and stores.

[36] On 9 March 1815 the US privateer Kemp, Captain Joseph Almeda, captured the British merchantman Ottawa, James Simpson, master, which was off Cuba while sailing from Liverpool to Jamaica with porter, soap, potatoes, hams, cheese, etc.