On 17 December Sirène and the French corvette Bergère were sailing to France from Cayenne when they were able to capture the East Indiaman Calcutta off Madeira.

[1] On 8 June 1805 Sirène was part of a Franco-Spanish fleet under Admiral Villeneuve, which intercepted a homeward-bound convoy of 15 merchant vessels under the escort of the frigate Barbadoes and the schooner or sloop Netley.

The two British warships managed to escape, but Villeneuve's fleet captured the entire convoy, valued at some five million pounds.

In early 1808 Sirène and Italienne were returning to France from Martinique when they encountered, captured, and destroyed three British merchantmen, Sappho, Sarah King, and Windham.

It seemed at first that the French squadron would easily beat the British to Lorient, but as they closed to shore, the wind became too weak and the frigates had to be taken in tow by their boats.

By the time wind had returned, Impetueux and Aigle had closed so much that Duperré deemed it impossible to reach Lorient before being caught, and he decided to seek the support of the batteries at Groix.

Fearing that the British would attack again before he could moor Sirène in a strong defensive position, Duperré beached her at Pointe des Chats, under the Lacroix battery.