French screw steam floating battery la Congreve (1854) in 1859

Homeport Brest, France. Laid down a Rochefort, France on 4 September 1854, launched on 1 June 1855 and being fitted out in March 1859. Machinery manufactured at Le Creuzot, France and delivering 225hp. Wood built. Armed with 18 guns.

Source
Hans Busk. The Navies of the World, London, United Kingdom, 1859.