The decline of Verdun was even more complete. From the strongest point in French defence it became the weakest. When the Germans took St. Mihiel in September, 1914, they cut the north and south railroad that binds Verdun to the Paris-Nancy Railroad. When they retreated from the Marne they halted at Varennes and Montfaucon, and from these points they command the Paris-Verdun-Metz Railroad. Apart from a single narrow-gauge railroad of minor value, which wanders among the hills, climbing at prohibitive grades, Verdun is isolated from the rest of France. Consider what this means in modern war when the amount of ammunition consumed in a day almost staggers belief. Consider what it means when there are a quarter of a million men to be fed and munitioned in this sector.
More than all this, when the lines came down to the trench condition Verdun was a salient, it was a narrow curve bulging out into the German front. It was precisely the same sort of military position as Ypres, which the Germans have twice before selected as the point for a great attack. In the Verdun sector the French are exposed to a converging fire; they are inside the German semicircle. Moreover, the salient is so narrow that the effect of converging fire is not to be exaggerated.
When the French attacked the Germans in Champagne last fall they advanced on a wide front from a line parallel to the German line. As they pierced the first German lines they were exposed to the converging fire of the Germans, because they were pushing a wedge in. Ultimately they got one brigade through all the German lines, but it was destroyed beyond by this converging fire. But as the Germans advanced upon Verdun they were breaking down a salient and possessed the advantage they had had on the defensive in Champagne.
Finally, one-half the French army of Verdun fought with its back to a deep river, connected with the other half only by bridges, some of which presently came under German fire, and there was every possibility that these troops might be cut off and captured if the German advance were pushed home far enough on the west bank of the Meuse and the German artillery was successful in interrupting the passage of the river. It was a perilous position and there were some days when the situation seemed critical.