From December 1804 to May 1805, under Lieutenant de vaisseau Jean-Jacques-Jude Langlois, she patrolled between Dunkirk and Hellevoetsluis, and then cruised the coasts of England, Scotland and Ireland.

Between 15 April 1806 and 13 January 1807, Sylphe was in the roads of the Île-d'Aix, still under the command of Langlois for part of the time.

[a] On 17 January 1807 Sylphe was in the roads of Lorient under the command of lieutenant de vaisseau Le Maresquier.

On 9 August 1808 Sylphe, under the command of capitaine de frégate M. Louis Marie Clément,[8] (a Member of the Legion of Honour), sailed with Diligente and Espiègle, to carry supplies from Lorient to Guadeloupe.

[8] In the 20-minute engagement, the French suffered seven men killed and five wounded, most severely; the British had no casualties.

[11] In 1847 the Admiralty awarded the Naval General Service Medal with clasp "Comet 11 Augt.