Congrève was a ironclad floating battery built for the French Navy during the Crimean War. Completed in 1855, she was intended to serve in the Baltic Sea against the Russian Empire, but operations there ended before she could leave France. The ship was stricken from the navy list in 1867 and scrapped the following year.
Design and development The Dévastation class consisted of five ironclad floating batteries designed during the Crimea War. The design was ordered by Emperor Napoleon III after the Battle of Sinope, informed by the experience of the French Navy from the conflict. They were designed with a shallow draft so that they could attack Russian coastal forts.
The ships had an overall length of , a beam of and a draft of . They displaced . The Dévastation class was powered by a single two-cylinder high-pressure direct-acting steam engine that used steam provided by six locomotive boilers to drive the single propeller shaft. The engine was rated at . To complement the engine, the ships were originally equipped with three masts with a total sail area of , but these caused them to roll heavily and were replaced by lighter pole masts. The ships were designed to reach , but could only attain between and . The ships proved underpowered and frequently had to rely on other vessels to tow them to their station.
Ships of the Dévastation class carried a main battery of sixteen , 50-pounder smoothbore guns on the main deck. The upper deck housed two 18-pounder smoothbore guns or two 12-pounder carronades. The ships were protected by a full-length waterline belt of wrought iron that was thick. Protection for the gun battery was thick. Armored hatch covers protected the gun ports and the oak deck was covered with a sheet of iron. The ship's complement numbered 280 or 282 sailors of all ranks. An additional 40 marines could also be carried.
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