GERMAN PLAN OF ATTACK.--As soon as the German leaders had determined upon war, their military machine was set in motion. The plan was first to attack France and crush her armies before the slow-moving Russians could get a force together; and then, after the defeat of France, to turn to the east and subdue Russia. The success of the plan was dependent upon the swift overthrow of France; and this in turn hinged upon the question as to whether German armies could invade France before the French were ready. Speed was the essential thing, and in order to gain speed Germany committed one of the greatest crimes in modern history. From the nearest point on the German boundary to Paris is only one hundred and seventy miles. But no rapid invasion of France could be made in this direction for two reasons: first, because of the very strong forts which protected the French frontier; and second, on account of the nature of the land, which presents to the east a series of five easily defended ridges, each of which would have to be stormed by an invader. A German attack directly across the French frontier could move but slowly past these natural and military obstacles; and the French nation would have ample time to mobilize its forces. Consequently the German military leaders determined to attack France from the northeast. Here a comparatively level plain stretched from Germany through Belgium and France up to Paris itself. Many good roads and railways traversed the land. Few natural barriers existed to aid the defenders, and France, trusting to the neutrality of Belgium, had no strong fortifications on her northeastern frontier. One obstacle to German invasion existed; it was what the German Chancellor once[2] called "a scrap of paper"--a promise to respect the neutrality of Belgium, which Prussia, France, and England had agreed to by formal treaties. Similar treaties guaranteed the neutrality of Luxemburg, a small country east of Belgium. Upon these promises France had depended for the protection of her northeastern border; for the German Empire had accepted all the rights and all the duties of the treaties made by Prussia. But now, under the plea of necessity which "knows no law," the German rulers determined to break their promises, violate the neutrality of Belgium and Luxemburg, and crush France before an aroused and alarmed world could interfere.