The submarine has proven its power, it is true, and against the battleship; but always where the element of _surprise_ has entered into its attack in quite a different fashion from that which is inherent in its always mysterious and stealthy nature. The battle cruiser has shown the value of speed and long-range guns combined, but in a comparatively restricted field. The destroyer has played a part in coast patrol and has doubtless accounted for a number of submarines; but in its proper sphere of activity it has accomplished nothing. And the wonderful achievements of the airship have been practically confined to operations on land. We have waited vainly and shall continue so to wait for the one supreme lesson which the war has been expected to yield, unless it chance that on some day to be forever memorable in the annals of the world there shall sweep out upon the stormy waters of the North Sea two fleets complete in every type of craft that human ingenuity has thus far contrived, to engage in a struggle to the death--a struggle by which the issue of the war may be decided in an hour, and in a fashion incomparably more dramatic than anything which the warfare on land, with all its horrors, has presented or by any possibility can present. Pending this one great lesson, what is it that the war has taught? First of all, it has taught once more the old, old lesson that has been taught by practically every war in which sea power has been a factor, that where this element is a factor, it is a factor of decisive importance. The British navy may not win the war for England, but it is every day more apparent that if the British navy did not exist, or if it dominated the sea less decisively than it does, the cause for which England stands would be a lost cause. And the extraordinary feature of the situation is that the navy is accomplishing its mission by merely existing. Thus far the "Grand Fleet" has not struck a blow. From its position on the English coast it looks across to the mouth of the Kiel Canal, and--waits! Its patrols are always on guard, the coasts which it defends are never threatened, and the commerce which trusts to its protection comes and goes with practically no thought of danger. For several months during the submarine campaign against commerce, something like one-half of one per cent of the merchant vessels bound to and from the ports of England were sunk. But no industry was crippled for a moment, and neither the necessities nor the luxuries of life were appreciably curtailed. Even at the height of the submarine operations, great transports loaded with troops crossed the English Channel freely, and out of a million and a half of soldiers so transported not a single one was lost. It is safe to say that in any three months since the war began the British navy has repaid the cost of its maintenance for a century in pounds, shillings, and pence; and in the sense of security which its existence and