“Errors,” “vanities”? These words must be justified, however gently, however briefly. To regard the battle of the Marne without reference to the grievous beginnings that led to and shaped it would be to belittle and falsify a subject peculiarly demanding care for true perspective. The battle may be classed as negatively decisive in that it arrested the invasion long enough to enable the Allies to gain an equality of forces, and so to prevent a final German victory; it was only positively decisive in the larger sense that it re-created on a sounder base the military spirit and power of France, which alone among the Western Allies seriously counted in that emergency, and, by giving the army a new direction, the nation a new inspiration, made it possible for them to sustain the long struggle that was to follow. Perilous illusions, military as well as pacifist, were buried beside the Marne. A fashion of thought, a whole school of teaching was quietly sunk in its waters. The French mind rose to its full stature as the nature of the surprise into which it had fallen broke upon it. This surprise was threefold. In the first place, the German plan of campaign was misconceived. That plan was grandiose in its simplicity. It rested upon a sound sense of the separation of the Allies: their geographical dispersion, which gave the aggressor the advantages famous in the career of Frederick the Great, as in that of Napoleon; the diversity of character, power, and interest within the Entente, which was, indeed, hardly more than an improvisation, without any sort of common organ, so far; its lack of unity not only in command but in military theory and practice generally. The first of these data indicated to the German Command the Frederician succession of swift offensives; the second narrowed the choice for the first effort, and suggested an after-work of political intrigue; the third had fortified Prussian pride and discipline with a daring strategy and an armament superior, in most respects, to anything the rest of the world had conceived to be possible. Which of the three great States, then, should be first struck down? The wildest Pan-Germanist could not reply “England,” in face of her overwhelming sea-power. So the British Empire, with the North Sea and Channel coasts, were, for the moment, ignored. Its internal problems, its peaceful, almost neutral, temper, its slow-mindedness in European affairs, were more regarded than the trivial military force which alone England could at once offer its friends. For speed was to be of the essence of the plan. Remained France and Russia; and here political as well as military calculations entered. The inchoate Empire of the East would, it was thought, be the slower in getting to its feet. Would a new Moscow expedition break its will for self-defence? The author of the “Willy-Nicky” letters imagined a better way. France would stand by her ally. The “Republic of the