Not all the French conquests were lost, nor by any means was the whole great effort of the reign destroyed. But the peril which the military aptitude of the French under so great a man as Louis XIV. presented to the minor States of Europe and to the Austrian empire was definitely checked when the campaign of Blenheim was brought to its successful conclusion. That battle was the first of the great defeats which exhausted the resources of Louis, put him, for the first time in his long reign, upon a close defensive, and restored the European balance which his years of unquestioned international power had disturbed. Blenheim, then, may justly rank among the decisive actions of European history. In connection with the campaign of which it formed a part, it gave to that campaign all its meaning and all its complete success. In connection with the general struggle against Louis, that campaign formed the turning point between the flow and the ebb in the stream of military power which Louis XIV. commanded and had set in motion. From the day of Blenheim, August 13th, 1704, onwards, the whole French effort was for seven years a desperate losing game, which, if its end was saved from disaster by the high statesmanship of the king and the devotion of his people, was none the less the ruin of that ambitious policy which had coincided with the great days of Versailles. * * * * * The war was conducted, as I have said, by various allies. Its success depended, therefore, upon various commanders regarded as coequal, acting as colleagues rather than as principals and subordinates. But the story of the great march to the Danube and its harvest at Blenheim, which we are about to review, sufficiently proves that the deciding genius in the whole affair was that of John Churchill, Duke of Marlborough. The plan was indeed Eugene's; and in the battle itself he shared the glory with his English friend and colleague. Again, the British troops present were few indeed compared with the total of the allied forces. At Blenheim, in particular, they amounted to less than a third of the numbers present. The excellence of their material, however, their magnificent work at the Schellenberg and on Blenheim field itself, coupled with the fact that the general to whom the final success is chiefly due was the great military genius of this country, warrants the historian in classing this battle among British actions, and in treating its story as a national affair. * * * * * I will approach the story of the campaign and of the battle by a conspectus of the field of war in which Marlborough was so unexpectedly to show the military genius which remains his single title to respect and his chief claim to renown. PART II THE EARLY WAR