The greatness of the British navy, compared with that of the British army and the other elements of Great Britain’s government, has taken on magnified dimensions during the last half century.  So long as war-ships used sails as their principal motive power, so long were they forced to employ methods of construction and equipment that forbade the efficient employment of high-power guns, the attainment of great speed, and the use of instruments of precision; so long, in other words, was their military effectiveness prevented from increasing greatly.  But when the British navy decided to abandon sail power altogether and propel their ships by steam, a new phase was entered upon, in which every resource of the engineering arts and the physical sciences was called into requisition; and now, on board a dreadnaught, battle cruiser, destroyer, or submarine, can be found the highest examples of mechanical and electrical art and science.  Every material resource which the brain and wealth of man can compass is enlisted in her naval defense; and in order to take advantage of the rapidity and certainty of movement they afford for operating fleets and ships, there has been a great advance in methods of operation, or, in military parlance, “staff work.”  To assist this work, the radio, the cable, and even the humble typewriter have contributed their essential share, with the result that to Great Britain’s naval defense there has been devoted an extraordinary degree of efficiency, continuous effort, a more varied activity, and a larger expenditure of money than to any other object of man’s activity.

The United States navy, to which is committed the naval defense of the United States, has followed the same lines as the British; and its task, while in some ways easier, is in other ways more difficult.  Perhaps the chief reason why the naval defense of Great Britain is so difficult is the extreme closeness of her borders to the borders of her possible foes—­for the English Channel is only twenty-three miles across from Dover to Calais.  And yet the very narrowness of the Channel there lends a certain element of assistance to the defender of either coast against an enemy like Germany, because it enables the defender, by simply protecting that narrow area, to prevent an enemy from passing to the sea or from it, except by going around the British Isles.  But while it is interesting thus to compare the tasks of two navies by comparing the lengths of coast line, populations, wealth, and areas of their countries, or their distances from possible antagonists, such comparisons are really misleading; for the reason that all nations are on a par in regard to the paramount element of national defense, which is defense of national policy.  It was as important to Belgium as it was to Germany to maintain the national policy, and the army of Belgium was approximately as strong as that of Germany in proportion to her wealth, area, and population; but nevertheless the Belgium army was routed, and Belgium was conquered by the German army.