 Complete the following phrase:  In the 1850s, the British and French navies deployed iron-armoured floating batteries as a supplement to the wooden steam battlefleet in the Crimean War. The role of the battery was to assist unarmoured mortar and gunboats bombarding shore fortifications. The French used three of their ironclad batteries Lave, Tonte, and Dévastation in 1855 against the defences at the Battle of Kinburn 1855 on the Black Sea, where they were effective against Russian shore defences. They would later be used again during the 