"Mobilization," answered the master, "means getting ready to move. It means the organizing of an army, bringing troops from distant garrisons, artillery from concentration points, arranging food depots from which provision trains can be run regularly, munition depots to feed the guns, preparation and equipment of hospitals in the field and at the bases, wounded transportation and ambulance systems, stables, forage depots and veterinary stations for the cavalry and artillery horses, repair shops for military machinery, supply depots for uniforms and equipment, and a thousand other things besides. Each of these must interlock and have its place. Each one must move along a route, mapped out in advance and by a time-table as rigid as that of a railroad. A modern army on the march is a segment of civilization on the move and almost every department of human industry is represented. The mobilization and handling of an army is the most staggering problem of organization known to the human race." "One never thinks of all that," said Horace, thoughtfully. "To proceed with the events that led to war," the master continued, looking at his watch and speaking more quickly. "On July 25, Austria notified Servia that she was dissatisfied with the reply to the ultimatum. This was equal to a declaration of war. The next day, Russia, seeing Germany's hand behind the Austrian plot, warned the Kaiser that interference would not be tolerated. This declaration from Russia imbroiled her ally, France. Belgium, being required to keep an army of defense on her frontier, commenced to mobilize also. "The very next day, July 27, the Austrians invaded Servia. At almost the same hour, shots were exchanged between German and Russian sentries on the frontier. On July 28, war began between Austria and Servia. Great Britain, at this time, was striving with might and main to keep the war from spreading and had urged both Germany and Russia to keep the peace. "On July 31 Germany forced the European War by simultaneous action at two points. She sent an ultimatum to Russia, ordering her to cease mobilization within 12 hours. She sent an ultimatum to France demanding neutrality and asserting that she would require the keys of the French fortresses of Verdun and Toul as guarantee of that neutrality."[1] "By what right?" "None in the world! It was impossible for Russia to demobilize, with her neighbor and ally Servia already under the fire of Austrian guns; it was equally impossible for France to hand over the keys of her main defensive positions to her arch-enemy. "On August 1, Germany declared war on Russia, and advanced her army to striking distance of the Belgian frontier. On August 2--that was the day before yesterday--German troops crossed the French frontier at three points and invaded Luxemburg, an independent state. That evening, Germany notified Belgium that she intended to violate her neutrality."