Demologos was the first warship to be propelled by a steam engine. She was a wooden floating battery built to defend New York Harbor from the Royal Navy during the War of 1812. The vessel was designed to a unique pattern by Robert Fulton, and was renamed Fulton after his death. Because of the prompt end of the war, Demologos never saw action, and no other ship like her was built.
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Foto: Wikimedia Commons — Engraving published by B. Tanner, No. 71 South 3rd. St., Phi, Acroterion, Rhododendrites (proste licence / javna domena)