The reduction of range of action is scarcely less important. In the old days a cruising ship could be stored for six months, and so long as she could occasionally renew her fuel and water, she was free to range the sea outside the defended areas for the whole of the period with unimpaired vitality. For such pelagic operations her movement was practically unrestricted. She could run for two or three days from a superior enemy or chase for as long without loss of energy, and she could wait indefinitely at a likely spot, or change her ground, as danger or hope of plunder dictated. So long as she had men left to man her prizes, her power of mischief was almost unlimited. All this is now changed. The capacity of each cruise of a ship to-day is very small. She is confined to short dashes within a strategically defended area, or if she is bent on pelagic operations, is compelled to proceed so far to find undefended waters that her coal will scarcely permit of more than a few days' actual cruising. A couple of chases at high speed during that period may force her to return at once, subject only to the precarious possibility of renewing her coal from a prize. She has, further, to face the fact that manning prizes must necessarily reduce her capacity for speed, which depends so much on a fully manned engine-room. This will tend to jeopardise her chances of return through or near defended areas. The only escape from this difficulty is to sink the captured ship. But this course has objections scarcely less weighty than the other. No Power will incur the odium of sinking a prize with all hands, and their removal to the captor's ship takes time, especially in bad weather, and the presence of such prisoners in a cruiser in any number soon becomes a serious check on her fighting power. In the case of large ships, moreover, the work of destruction is no easy matter. In the most favourable circumstances it takes a considerable time, and thus not only eats into the cruiser's endurance, but decreases her chances of evasion. From these and similar considerations it is obvious that the possibilities of operations on the great trade-routes are much less extensive than they were formerly, while to speak of cruisers "infesting" those routes is sheer hyperbole. Under modern conditions it is scarcely more feasible than it would be to keep up a permanent blockade of the British Islands. It would require a flow of ships in such numbers as no country but our own can contemplate possessing, and such as could not be maintained without having first secured a very decided preponderance at sea. The loss of radius of action therefore, though it does not increase the power of defence, sensibly lessens that of attack by pelagic operations.