The armed force in every state has had not only continuous existence always, but continuous, potential readiness, if not continuous employment; and the greatest changes in the mutual relations of nations have been brought about by the victory of the armed force of one state over the armed force of another state. This does not mean that the fundamental causes of the changes have been physical, for they have been psychological, and have been so profound and so complex as to defy analysis; but it does mean that the actual and immediate instrument producing the changes has been physical force; that physical force and physical courage acting in conjunction, of which conjunction war is the ultimate expression, have always been the most potent instruments in the dealings of nations with each other.
Is there any change toward peaceful methods now?
No, on the contrary; war is recognized as the most potent method still; the prominence of military matters is greater than ever before; at no time in the past has interest in war been so keen as at the present, or the expenditure of blood and money been so prodigal; at no time before has war so thoroughly engaged the intellect and energy of mankind.
In other words, the trend of the nations has been toward a clearer recognition of the efficacy of military power, and an increasing use of the instrumentality of war.
This does not mean that the trend of the nations has been regular; for, on the contrary, it has been spasmodic. If one hundred photographs of the map of Europe could be taken, each photograph representing in colors the various countries as they appeared upon the map at one hundred different times, and if those hundred photographs could be put on films and shown as a moving-picture on a screen, the result would resemble the shifting colored pieces in a kaleidoscope. Boundaries advanced and receded, then advanced again; tribes and nations moved their homes from place to place; empires, kingdoms, principalities, duchies, and republics flourished brilliantly for a while, and then went out; many peoples struggled for an autonomous existence, but hardly a dozen acquired enough territory or mustered a sufficiently numerous population to warrant their being called "great nations." Of those that were great nations, only three have endured as great nations for eight hundred years; and the three that have so endured are the three greatest in Europe now—the French, the British, and the German.
Some of the ancient empires continued for long periods. The history of practical, laborious, and patient China is fairly complete and clear for more than two thousand years before our era; and of dreamy, philosophic India for almost as long, though in far less authentic form. Egypt existed as a nation, highly military, artistic, and industrious, as her monuments show, for perhaps four thousand years; when she was forced by the barbarians of Persia into a condition of dependence, from which she has never yet emerged. The time of her greatness in the arts and sciences of peace was the time of her greatest military power; and her decline in the arts and sciences of peace accompanied her decline in those of war. Assyria, with her two capitals, Babylon and Nineveh, flourished splendidly for about six centuries, and was then subdued by the Persians under Cyrus, after the usual decline. The little kingdom of the Hebrews, hardy and warlike under Saul and David, luxurious and effeminate under Solomon, lasted but little more than a hundred years. Persia, rising rapidly by military means from the barbarian state, lived a brilliant life of conquest, cultivated but little those arts of peace that hold in check the passions of a successful military nation, yielded rapidly to the seductions of luxury, and fell abruptly before the Macedonian Alexander, lasting less than two hundred and fifty years. Macedonia, trained under Philip, rose to great military power under Alexander, conquered in twelve years the ten most wealthy and populous countries of the world—nearly the whole known world; but fell to pieces almost instantly when Alexander died. The cities of Greece enjoyed a rare pre-eminence both in the arts and sciences of peace and in military power, but only for about one hundred and fifty years: falling at last before the superior military force of Macedon, after neglecting the practice of the military arts, and devoting themselves to art, learning, and philosophy. Rome as a great nation lasted about five hundred years; and the last three centuries of her life after the death of Commodus, about 192 A. D., illustrate curiously the fact that, even if a people be immoral, cruel, and base in many ways, their existence as an independent state may be continued long, if military requirements be understood, and if the military forces be preserved from the influence of the effeminacy of the nation as a whole. In Rome, the army was able to maintain a condition of considerable manliness, relatively to the people at large, and thus preserve internal order and keep the barbarians at bay for nearly three hundred years; and at the same time exert a powerful and frequently deciding influence in the government. But the effeminacy of the people, especially of those in the higher ranks, made them the creatures of the army that protected them. In some cases, the Emperor himself was selected by the army, or by the Pretorian Guard in Rome; and sometimes the guard removed an Emperor of whom it disapproved by the simple expedient of killing him.
After the fall of the Western Empire in 476, when Rome was taken by Odoacer, a condition of confusion, approaching anarchy, prevailed throughout Europe, until Charlemagne founded his empire, about 800 A. D., except that Constantinople was able to stand up against all outside assaults and hold the Eastern Empire together. Charlemagne's empire united under one government nearly all of what is now France, Germany, Austria, Italy, Belgium, and Holland. The means employed by Charlemagne to found his empire were wholly military, though means other than military were instituted to preserve it. He endeavored by just government, wise laws, and the encouragement of religion and of education of all kinds to form a united people. The time was not ripe, however; and Charlemagne's empire fell apart soon after Charlemagne expired.
The rapid rise and spread of the Mohammedan religion was made possible by the enthusiasm with which Mahomet imbued his followers, but the actual founding of the Arabian Empire was due wholly to military conquest, achieved by the fanatic Mussulmans who lived after him. After a little more than a hundred years, the empire was divided into two caliphates. Brilliant and luxurious courts were thereafter held by caliphs at Bagdad and Cordova, with results similar to those in Egypt, Persia, Assyria, and Rome; the people becoming effeminate, employed warriors to protect them, and the warriors became their masters. Then, effeminacy spreading even to the warriors, strength to resist internal disorders as well as external assaults gradually faded, and both caliphates fell.
From the death of Charlemagne until the fall of Constantinople, in 1453, the three principal nations of Europe were those of France, Germany, and England. Until that time, and dating from a time shortly before the fall of Rome, Europe was in perpetual turmoil—owing not only to conflicts between nations, but to conflicts between the Church of Rome and the civil power of the Kings and Emperors, to conflicts among the feudal lords, and to conflicts between the sovereigns and the feudal lords. The power of the Roman Church was beneficent in checking a too arrogant and military tendency, and was the main factor in preventing an utter lapse back to barbarism.
The end of the Middle Ages and the beginning of what are usually called "Modern Times" found only four great countries in the world—France, Germany, Spain, and England. Of these Spain dropped out in the latter part of the sixteenth century. The other three countries still stand, though none of them lies within exactly the same boundaries as when modern times began; and Austria, which was a part of Germany then, is now—with Hungary—a separate state and nation.