A 'floating battery' is a kind of armed watercraft, often improvised or experimental, which carries a heavy armament but has few other qualities as a
warship.
The most notable floating batteries were built or designed in the 1800s, and are related to the development of first the steam warship and the
ironclad warship.
''
Demologos'', the first steam-propelled warship, was a floating battery designed for the protection of New York Harbor in the War of 1812.
In the 1850s, the British and French navies deployed iron-armored floating batteries as a supplement to the wooden steam battlefleet in the
Crimean War. The role of the battery was to assist unarmored mortar and gunboats bombarding shore fortifications. The French used their batteries in 1855 against the defenses at
Kinburn on the
Black Sea, where they were effective against Russian shore defences. The British planned to use theirs in the
Baltic Sea against
Kronstadt, and were influential in causing the Russians to sue for peace.
[Lambert A. "Iron Hulls and Armour Plate"; Gardiner ''Steam, Steel and Shellfire'' p. 47-55] The development of such iron-armored batteries was step towards the development of
ironclad warships.
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