HMS Implacable was a 74-gun third-rate ship of the line of the Royal Navy. She was originally the French Navy's Duguay-Trouin, launched in 1800. She survived the Battle of Trafalgar only for the British to capture her at the subsequent Battle of Cape Ortegal. In British service she participated in the capture of the Imperial Russian Navy 74-gun ship of the line Vsevolod (Russian: Всеволод) in the Baltic in 1808 during the Anglo-Russian War. Later, Implacable became a training ship. Eventually, she became the second oldest ship in the Royal Navy after , Lord Nelson's flagship at Trafalgar. When the Royal Navy finally scuttled Implacable in 1949, she flew both the French and British flags side-by-side as she sank. French career Originally named Duguay-Trouin after René Trouin, Sieur du Gué. Construction, to a plan by Rolland but updated to a plan by Sané, began in 1794 but was interrupted in 1795. She was finally laid down in 1797, and launched at Rochefort in 1800. On 22 November 1802, under Captain Claude Touffet, she departed Toulon as part of a squadron commanded by Commodore Quérangal, also comprising the frigate Guerrière and the flagship Duquesne, a sister Téméraire-class vessel armed en flûte. Bound for Santo Domingo, the squadron found itself blockaded in Cap Français during the Blockade of Saint-Domingue by , , and . After a successful sortie in the dark, the squadron split up. Guerrière and Duguay-Trouin managed to escape but Vanguard, with , captured Duquesne. Under Capitaine de Vaisseau L'hermite she participated in an action at Cap Français. On 21 October 1805, Duguay-Trouin took part in the Battle of Trafalgar, where she was part of the vanguard of the French fleet under Contre-amiral Pierre Dumanoir le Pelley, and was one of four French ships that escaped capture that day. Capture On 3 November 1805, British Captain Sir Richard Strachan, with , , , and four frigates, defeated and captured what remained of the Franco-Spanish fleet. In the battle, the captain of Duguay-Trouin, Claude Touffet, was killed, her masts were shot away, and she was eventually captured. British service in the Napoleonic Wars The Royal Navy commissioned her as a third rate under the name HMS Implacable. Implacable served with the Royal Navy for the rest of the Napoleonic Wars. Anglo-Russian War In early 1808 Russia initiated the Finnish War in response to Sweden's refusal to bow to Russian pressure to