The advantages, again considered geographically, greatly outweigh the disadvantages. The first of these was the homogeneity of the Central Powers. A general could attend a war council in Berlin in the evening, and one in Vienna the next morning. The influence of Germany was an understood thing, moreover, and in Vienna there was a readiness to accept and carry out the policies of the German military staff. There was also a geographical homogeneity, due to modern facility of communication. Not only in mobilization, but in the entire conduct of the war, the geographic nearness of points in Germany and Austria was brought about by an excellent east and west railway system. The disadvantage of fighting on two fronts was partly compensated by the fact that within three days enormous masses of men could be moved from Galicia to the Rhine, or from the Belgian frontier to the wastes of East Prussia. In all Europe there is no stretch of land so well suited by nature for this task of fighting upon two fronts as the area of the combined Austrian and German Empires. This is emphasized by the topography of the Baltic Plain, the Rhine and Danube valleys. One might say, in a measure, that this stretch of territory has not wasted any of its natural mountain defenses by flinging them athwart the territory. Thus the Vosges defend against France, the Alps against Italy, the Transylvanian Alps against Rumania--in the event of that nation entering the war with Russia--the Carpathians behind Galicia against Russia's southern attacks, and the marshy country east of East Prussia against Russian northern attack. Yet it is to be added that these very advantages of defense were also disadvantages of attack. The march through Belgium would not have been necessitated if, for example, the portion of Central Powers territory that confronted France had been of the same character as that which confronted Russia. The mountainous character of that frontier was a determining factor in the invasion of Belgium. The invasion of Belgium was a determining factor in the relation which Germany sustained in the war to the allied powers, and especially to the neutral nations. The relation of the neutral nations, in modern warfare, which requires such immense supplies, is a factor of great importance for success in the field. Therefore, to close the syllogism, the mountainous character of the Vosges country was the primary factor in determining the relation of all other countries to the Central Powers, a factor constantly arising at every point in the Great War. On such geographical factors does the strategy of huge campaigns depend. One more example may be given. In the battles of the Marne it became evident that France's strongest defense was the Argonne Forest, in the battle of the Aisne it became clear that the geological formation of a river bank made the German position almost impregnable.