introduced soon after the reign began. They were first actively employed at the bombardment of Acre in 1840, and notwithstanding their old lines of construction, proved the usefulness of armed ships at sea against forts on land. The Acre operations seem to have been important, as showing for the first time the skill of Victorian seamen in gunnery and in the management of the machinery of steam ships. Similarly, long before this only the skill with which English ships were handled had overcome, in their encounters with French, the faults of their design. The weight of metal thrown by the largest guns on board these earlier craft, _e.g._ the 'Nelson,' was 2,750 lbs. Further steam progress was marked when, eight years after the reign began, the 'Erebus' and 'Terror' in which Sir John Franklin's expedition sailed for the Pole, were fitted with the screw. As yet iron had not been employed on the present scale in ship construction. Both in 1857 and 1858 larger ships than had yet been known, the 'Niagara' first, the 'Orlando,' the 'Mersey,' afterwards, were built, all, however, of wood. Long after steam was partially employed, sails were retained. Even during our Black Sea and Baltic operations in Crimean days, screw and paddle were still combined with canvas. Such success as our fleet secured at this time was not promoted by the excellence of our naval organization which according to Captain Eardley Wilmot, was not much better than our military.[73] The first lesson as to the new mode of motion by sea learnt from the naval operations in Crimean waters was recognized by Kinglake and is confirmed by Captain Eardley Wilmot as being that 'in regions where land and sea much intertwine, steam is stronger for attack than for defence.' The iron ships now almost as essential to the idea of a navy as steam itself, had been tried for different purposes long before our Admiralty adopted them; the material had been used, first in 1812 for canal barges, secondly, a little later, for the mercantile marine. Iron was not employed for our navy till the last days of William IV. The tragic fate of the first iron ship, the 'Birkenhead,' may well have prejudiced both the Department and the public against the new material.