Our regimental officers and men knew nothing of all this high strategy, nothing of the international difficulties which confronted our High Command. They knew only that they had to attack strong and difficult positions and that the immediate success depended upon their own leadership and the courage and training of their men. They were sure of that and hoped for a victory which would break the German spirit. They devoted themselves to the technical details of their work, and only in subconscious thought pondered over the powers that lie behind the preparations of battle and decide the fate of fighting men. The scenes in Arras and on the roads that lead to Arras are not to be forgotten by men who lived through them. Below ground as well as above ground thousands of soldiers worked night and day for weeks before the hour of attack. Above ground they were getting many guns into position, making roads, laying cables, building huts and camps, hurrying up vast stores of material. Below ground they were boring tunnels and making them habitable for many battalions, with ventilation shafts and electric light. All the city of Arras has an underground system of vaults and passages dug out in the time of the Spanish Netherlands when the houses of the citizens were built of stone quarried from the ground on which they stood. These subterranean passages were deepened and lengthened until they went a mile or more beyond Arras to the edge of the German front lines. The old vaults where the merchants kept their stores were propped up and cleaned out, and in this underground world thousands of our men lived for several days before the battle waiting for "zero" hour on April 9, when they would come up into the light and see the shell-fire which was now exploding above them, unloosing boulders of chalky rock about them and shaking the bowels of the earth. The enemy knew of our preparations and of this life in Arras, and during the week before the battle he flung many shells into the city, smashing houses already stricken, "strafing" the station and the barracks, the squares and courtyards, and the roads that led in and out. During the progress of the battle I went many times into the broken heart of Arras while the bodies of men and horses lay about where transport columns had gone galloping by under fire and while the shrill whine of high velocities was followed by the crash of shells among the ruins. In the town and below it there were always crowds of men during the weeks of fighting outside. I went through the tunnels when long columns of soldiers in single file moved slowly forward to another day's battle in the fields beyond, and when another column came back, wounded and bloody after their morning's fight.