A great battle, especially if it be of a decisive character, not only changes history, but has a dramatic quality about it which fixes the attention of mankind. The general reader, therefore, tends to regard the general movements of a campaign as mere preliminaries to, or explanations of, the decisive action which may conclude it. This is particularly the case with the readers attached to the victorious side. The French layman, in the days before universal service in France, wrote and read his history of 1805 as though the march of the Grand Army were deliberately intended to conclude with Austerlitz. The English reader and writer still tends to read and write of Marlborough's march to the Danube as though it were aimed at the field of Blenheim. This error or illusion is part of that general deception so common to historical study which has been well called "reading history backwards." We know the event; to the actors in it the future was veiled. Our knowledge of what is to come colours and distorts our judgment of the motive and design of a general. The march to the Danube was, like all strategic movements, a general plan animated by a general objective. It was not a particular thrust at a particular point, destined to achieve a highly particular result at that point. Armies are moved with the object of imposing political changes upon an opponent. If that opponent accepts these changes, not necessarily after a pitched battle, but in any other fashion, the strategical object of the march is achieved. Though the march conclude in a defeat, it may be strategically sound; though it conclude in a victory, it may be strategically unsound. Napoleon's march into Russia in 1812 was strategically sound. Had Russia risked a great battle and lost it, the historical illusion of which I speak would treat the campaign as a designed preface to the battle. Had Russia risked such a battle and been successful, the historical illusion of which I speak would call the strategy of the advance faulty. As we know, the advance failed partly through the weather, partly through the spirit of the Russian people, not through a general action. But in conception and in execution the strategy of Napoleon in that disastrous year was just as excellent as though the great march had terminated not in disaster but in success. Similarly, the reputation justly earned by Marlborough when he brought his troops from the Rhine to the Danube must be kept distinct from his tactical successes in the field at the conclusion of the effort. He was to run a grave risk at Donauwörth, he was to blunder badly in attacking the village of Blenheim, he was to be in grave peril even in the last phase of the battle, when Eugene just saved the centre with his cavalry.