The entire class was a version of the Leda-class frigates, but built of red fir (pine), which was cheaper and more abundant than oak.

On 8 December 1814, two US gunboats fired on Sophie, Armide, and the sixth-rate frigate Seahorse[10] while the British were passing the chain of small islands that runs parallel to the shore between Mobile and Lake Borgne.

Lockyer drew his flotilla from the fleet that was massing against New Orleans, including the 74-gun Third Rate Tonnant, Armide, Cydnus, Seahorse, Manly, and Meteor.

In 1821 the survivors of the flotilla shared in the distribution of head-money arising from the capture of the American gun-boats and sundry bales of cotton.

[e] On 18 January 1815, Captain the Honourable William Henry Percy faced a court martial on board Cydnus, off Cat Island, Mississippi, for the loss of his vessel, Hermes, during his unsuccessful attack at the Battle of Fort Bowyer in September 1814.

[9] Sir Alexander Cochrane appointed Captain Robert Cavendish Spencer, of the sloop Carron,[16] to command Cydnus in 1815,[2] for his efforts in Louisiana and Florida.

Spencer then spent a month camped at Prospect Bluff on the Apalachicola River with Britain's Indian allies, charged with settling their claims and dismissing them from British service.

[2] Cydnus was among the ships and vessels under the command of-Admiral Lord Viscount Keith entitled to share in the Parliamentary grant for service in 1813 and 1814.

[26] This article includes data released under a Creative Commons Attribution-ShareAlike 3.0 Unported UK: England & Wales Licence, by the National Maritime Museum, as part of the Warship Histories project.