We climbed into our automobiles and hurried out of town along a road in plain sight of the German guns. I thought of what General Foch had said: "We can go through them any time we desire." I got out my military map and looked at the German line, slipping gradually from the plateau of Artois into the plain of Douai--the plain that contains Lens, Douai and Lille and sweeps away across the frontier of Belgium. That was the place to which General Foch referred when he said the Germans "must keep on going away." I turned to an officer beside me in the car. I said: "When the French guns are sweeping that plain it means the end of the Germans in Northern France?" He smiled and nodded, while I offered a silent prayer that on that day I might be permitted by the military authorities to make my fourth visit to Artois, to see the decisive victory of French arms that I believe will take place there under the command of General Foch, and that will help largely to bring this war to a close. CHAPTER XV THE BATTLE OF THE LABYRINTH This is a story about what, in the minds of the French military authorities, ranks as the greatest battle in the western theater of operations, following the battle of the Marne. So far as I know the battle has never received an official name. The French _communiqués_ have always vaguely referred to it as "operations in the sector north of Arras." I cannot minutely describe the conflict; no one can do that now. I can, however, tell what I saw there when the Ministry of War authorized me to accompany a special mission there, to which I was the only foreigner accredited. I purpose to call this struggle the Battle of the Labyrinth, for "labyrinth" is the name applied to the vast system of entrenchments all through that region, and from which the Germans have been literally blasted almost foot by foot by an extravagant use of French melinite. This battle was of vital importance because a French defeat at the Labyrinth would allow the Germans to sweep clear across Northern France, cutting off all communication with England. The battle of the Labyrinth really began in October, 1914, when General de Maud'huy stopped the Prussian Guard before Arras with his motley array of tired territorials, whom he had gathered together in a mighty rush northward after the battle of the Marne. These crack Guards regiments afterward took on the job at Ypres, while the Crown Prince of Bavaria assumed the vain task of attempting to break de Maud'huy's resistance and cut a more southward passage to the sea. All winter de Maud'huy worried him, not seeking to make a big advance, but contenting himself with the record of never having lost a single trench. With the return of warm weather, just after the big French advance in Champagne, this sector was chosen by Joffre as the place in which to take the heart out of his enemy by the delivery of a mighty blow.