After the Thirty Years' War an effort was made to alleviate, by careful training of the men, the horrors of war due to the outrages of the military rabble. Thus it was asserted in praise of Prince Eugène of Savoy that in the neighbourhood of his camp the peasant could till his field unmolested. Instead of war being made to feed itself, a complicated system of supplies was adopted. The result was that the war strategy of the weak voluntary armies of that time became fixed more and more into a conventional mould, from which Frederick the Great was the first to emancipate it, so far as the limited means available at that time rendered this possible. Subsequently, under Napoleon, war developed more and more into "true war," to use Fichte's expression. This transformation, however, could be fully effected only by means of universal military service. Universal military service holds sway over our age and for generations will not vanish. To it Prussia-Germany owes her advancement, and it was inevitable that, when all the Great Powers adopted it, the violence of war should again be augmented. We must not let the bright side of universal service blind us to its dark side. Henceforth the passion of war infected whole nations, and this passion was constantly inflamed anew by contact with that of the enemy. Therewith many of those barriers were overthrown by means of which the professional soldiery, preserving the chivalrous customs of the Middle Ages, had sought to check the excesses of war. Also the barriers which International Law had sought to oppose to the encroachments of war collapsed in the face of this new violence. At the same time factors were introduced into the World War which could not fail to react upon the strategical and tactical conditions and which it will be impossible to disregard in the future. They call for a new standard in measuring the efficiency of armies. Thus the efficiency of the German troops far surpasses that which might have been expected according to the standard of earlier times. Even in regard to the operations at the Loire at the turn of the year 1870-71, the late Field-Marshal Freiherr von der Goltz wrote in his Reminiscences[4]: "With the exception of a few stout hearts, everyone was sick of even the most successful battles. The fire of war still burnt, but with a dim and flickering light. The craving to enjoy at length the longed-for term of tranquillity was very widespread."