If a ship is not intended to close with an enemy, or to fight her anyhow and anywhere on the open sea—which certainly has been the dominant idea of the British navy, in so far as its great line-of-battle ships are concerned—if, for example, a combination of immense speed with one or two extremely powerful and well-protected guns should serve a particular object better than a slower and more fully protected ship would serve it—then even great destructibility in the ship itself may justifiably be incurred. But for general naval service, and in every case in which a ship is intended to accept battle with a powerful antagonist and fight it out, or to force an action when she encounters such an enemy, it cannot be wise to leave her so exposed that that enemy may almost certainly sink her or cause her to capsize by merely pouring any kind of shot or shell into her unarmored parts. But even the observance of the above general principle is not alone all that is desirable in armored line-of-battle ships. It is not well to leave even so much of the ends of such ships wholly exposed as may lead to the speedy loss in action of her steaming or steering powers. The armor-belt should be of sufficient length to fairly guarantee the ship against prompt disablement in action, and to do this it must be carried very much nearer to the bow and stern than it has been in the cases of the Italian ships (_Duilio_ and _Dandolo_) now under notice. On the other hand, where ships are formed with fine water-lines, and the two opposite sides are consequently very near to each other for many feet, it is quite unnecessary to cover them with armor. The buoyancy comprised between the two sides aft such parts is very small, and consequently penetration can let but little water into the ship, and do but little harm. It is a matter for the exercise of professional judgment where to draw the line between the armored and the unarmored parts. In the new British ships _Nile_ and _Trafalgar_, which have excited great admiration in England, there are about sixty feet of length at each end left without armor, and as the ships have fine lines, but are nevertheless of considerable breadth at sixty feet from the ends, it seems probable that good judgment has been shown by their designers in this matter.