As the campaign developed, the mobilization of the Germans on the west front was seen to have a double purpose. The armies of Von Kluck were to hold Belgium and the north of France, while the armies of the crown prince were to march through Luxemburg and batter down the Verdun-Belfort line. It has been shown how the rapid mobilization and gallant defense of Liege by the Belgians delayed the former. Without aircraft it was more than possible that, behind the screen of the forests of Luxemburg, France might not have known what forces were being concentrated on that frontier, and might have weakened the line to rush troops against Von Kluck. But the French aviators, who are the best in the world, were able to fly over the territory of Germany and Luxemburg where troops were mobilizing, and the information they sent down was sufficiently alarming to keep France from weakening the Franco-German fortress-defended line too seriously. This, again, handicapped France from being able to go to the support of Belgium. The dramatic plan of the crown prince's hammering march to Paris failed absolutely and completely by the successful defense of Verdun.
[Illustration: German-French Frontier, Fortresses of.]
The initial mobilization of Great Britain was a matter as well managed as that of Germany. For precision there was nothing to choose as between them. Yet, comparing the German and British mobilizations, one thing stands out clearly, viz., that Germany was ready and Britain unready, while, on the other hand, Germany had to move 4,000,000 men and England only 100,000. To offset this, Britain had to mobilize stores and supplies, not only for her own 100,000 expeditionary force, but for a large part of the armies of France and for all the armies of Belgium. Even the very motor busses that carried French troops from Paris to the Belgian frontier were largely English, two cargoes of 100 vehicles each being rushed across the English Channel on the same day.
The food question for the Belgian army and for the French armies on the Belgian frontier was acute at the opening of the war, France was ready and prepared to handle any eventuality in the way of supplies that might be needed on the Belfort-Verdun line, but she was not prepared for the conditions in the rear of the Belgian frontier. Britain came to the support of France and Belgium without a day's delay. She rushed food and munitions to the front, and on one occasion Kitchener fed two French army corps, or 80,000 troops, for eleven days without the slightest hitch. A moment's thought will show that this means not only the ability to send food, but also to organize the entire mechanism of the preparing and handling of that food.