French frigate Alcmène (1811)

	Alcmène (right) at the action of 16 January 1814
History
France
Name	Alcmène
Builder	Cherbourg
Laid down	July 1810
Launched	3 October 1811
Captured	16 January 1814
United Kingdom
Name	Dunira
Acquired	16 January 1814 (by capture)
Renamed	HMS Immortalite
Fate	Sold 1837
General characteristics
Class & type	Armide-class frigate
Displacement	1430 tonneaux
Tons burthen	759 port tonneaux; 107978⁄94 (bm);
Length	Overall: 152 ft 8 in (46.53 m); Keel: 127 ft 11+3⁄8 in (39.0 m);
Beam	39 ft 10 in (12.14 m)
Depth of hold	12 ft 7+1⁄2 in (3.848 m)
Propulsion	Sails
Complement	French service:320; British service:315;
Armament	French service: 28 × 18-pounder and 8 × 12-pounder guns + 4 × 36-pounder obusiers; British service, though it is not clear she was ever rearmed; UD:28 × 18-pounder guns; QD:14 × 32-pounder carronades; Fc:2 × 9-pounder guns + 2 × 32-pounder carronades;

Alcmène was a 44-gun Armide-class frigate of the French Imperial Navy launched in 1811. The Royal Navy captured her in the action of 16 January 1814, and renamed the ship as HMS Dunira and then HMS Immortalite but never commissioned her nor fitted her for sea. In March 1822 she became a receiving ship at Portsmouth. She was sold in January 1837. In 1813, along with Iphigénie, she served at Cherbourg, in the squadron of Counter-admiral Amable Troude, to protect the harbour.