Our new offensive was to be between the Meuse River and the western edge of the Argonne Forest. East of the forest is the little river Aire, and between its valley and the valley of the Meuse rises back of the German front a whale-back of heights, as I shall describe them for the sake of bringing a picture to mind, though the comparison is not absolute. The practical summit of the whale-back is to the eastward of the village of Buzancy. We may use Buzancy as a symbol: for it is only in a highly technical history that the detail of names, confusing to the general and even the professional reader, is warrantable. The summit of the whale-back gained, you are looking down an apron of rolling ground and small hills toward the turn of the Meuse westward past Sedan, where the German Army surrounded the French Army in the Franco-Prussian War. To the northeast, readily accessible to attack, are the Briey iron-fields, which were invaluable to the Germans for war material. Along the valley of the Meuse after it turns westward, and along the Franco-Belgian frontier runs the great railroad from Metz to Lille, which is double-track all the way and in large part four-track. Incidentally this connected the coal fields of northern France with Germany, but its main service was to form the western trunk line of communication for the German armies in Belgium and northern and eastern France. It was linked up with the railways spreading northward into Belgium and southward toward Amiens and Paris in the arterial system which gave its life blood to the German occupation. If this road were cut, the German troops in retreat would have to pass through the narrow neck of the bottle at Liége. The dramatic possibilities of gaining the heights of Buzancy and bringing the Lille-Metz tracks under artillery fire had the appeal of a strategic effect of Napoleonic days. The German staff had been fully aware of the danger when, in their retreat after their repulse on the Marne, which the world saw only as the spectacle of the French Army inflicting a defeat on an advancing foe, it used its tactical opportunity for choosing, with comparative deliberation, advantageous defensive positions from the Argonne Forest to the Meuse at the foot of the whale-back.