Courtesy Reuters

THE conflicts of armies have left their mark across history from the plains of Marathon to the woods of the Argonne. Sea power has guided the course of nations, often dominant over all other factors, from Salamis to Jutland. To war by land and sea we have added combat in a third element, more dreadful in its potentialities than either of the older forms, warfare in the air. The late European war offered but a foretaste of what may come when things that were the imaginings of fictionists a decade and a half ago are realized in grim truth and

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