The Austrian army advanced on Russia in force, expecting the success of the German armies to the east. From the plans as they developed, and particularly from railroad orders given to the lines crossing Germany, it was expected that before Russia could be mobilized sufficiently to do more than give a temporary check to the Austrian army, several German army corps could be released from the western front and sent to the Russian border to take the burden of Russian invasion away from Austria. But the resistance of Belgium against Von Kluck's armies, the resistance of France against the armies of the crown prince, and the resistance of England to all naval action, prevented any release of the German armies, and the mobilization orders for the transference of German troops from the western theatre to the eastern theatre of war during the first few weeks of the struggle proved to be unavailing, for the men could not be spared. Slowly but heavily the mobilization of Russian forces continued. Lacking strategic railroads, lacking the motor-lorry system of England, the heavy-footed but untiring Russian infantry marched the scores and hundreds of miles from their homes to the front. The Russian dirigibles and aeroplanes were more than a match for the Austrian aircraft, and kept them back from flying over the country to determine the number of forces opposing. Then the action of the Russian "steam roller" began, and with more men marching in every day, unwearied despite their long travel, the steam roller gathered force. But, in one regard, Russia had miscalculated. She had never contemplated the terrific wastage of ammunition that is required for modern artillery duels, gun conflicts that are necessary before troops can advance, and in the first few weeks of the war her ammunition was all shot away. Without ammunition the steam roller could not continue, and the advance of the Russians upon Austrian territory was first halted and then driven back. Here, again, then, was a campaign successfully begun because of a better mobilization of men than was expected, and lost because of a lack of mobilization of supplies.