 Complete the following phrase:  The American Civil War saw the use of casemate ironclads: armored steamboats with a very low freeboard and their guns on the main deck Casemate deck protected by a sloped armoured casemate, which sat atop the hull. Although both sides of the Civil War used casemate ironclads, the ship is mostly associated with the southern Confederacy, as the north also employed turreted monitors, which the south was unable to produce. The most famous naval battle of the war was the duel at 