It was toward morning that the destination of the column was reached, and, in single file, the men of Pen's section passed down an incline into their first communicating trench, and then past a maze of lateral trenches to the opening into the salients they were to supply. It was here that the soldiers whom they were to relieve filed out by them. Going forward, they took the places of the retiring section. At last they were in the first line trench, with the enemy trenches scarcely a hundred meters in front of them. Sentries were placed at the loop-holes made in the earth embankment, and the remainder of the section retired to their dug-outs. These under-ground rooms, built down and out from the trench, and bomb-proof, were capable of holding from eight to a dozen men. They were carpeted with straw, some of them had shelves, and in many of them discarded bayonets were driven into the walls to form hooks. It was in these places that the men who were off duty rested and ate and slept. In the gray light of the early June morning, Pen, who had been posted at one of the loop-holes as a listening sentry, looked out to see what lay in front of him. But the most that could be seen were the long and winding earth embankments that marked the lines of the German entrenchments, and between, on "no man's land," a maze of barbed wire entanglements. No living human being was in sight, but, at one place, crumpled up, partly sustained by meshes of wire, there was a ragged heap, the sight of which sent a chill to the boy's heart. It required no second glance to discover that this was the unrescued body of a soldier who had been too daring. Pen had seen his first war-slain corpse. Indeed, war was becoming to him now a reality. For, suddenly, a little of the soft earth at his side spattered into his face. An enemy bullet had struck there. In his eagerness to see he had exposed too much of his head and shoulders and had become the target for Boche sharpshooters. Other bullets pattered down around his loop-hole, and only by seeking the quick shelter of the trench did he escape injury or death. It was his first lesson in self-protection on the firing-line, but he profited by it. Two hours later he and Aleck, who had also been doing duty on a lookout platform, were relieved by their comrades, and threw themselves down on the straw of their dug-out and, wearied to the point of exhaustion, slept soundly. With the dawning of day the noise of cannonading increased, the whining of deadly missiles grew more incessant, the crash of exploding shells more frequent, but, until they were roused by their sergeant and bidden to eat their breakfast which had been brought by a ration-party, both boys slept. So soon had the menacing sounds of war become familiar to their ears. After breakfast those who were not on sentry duty were put to work repairing trenches, filling sand-bags, enlarging dug-outs, pumping water from low places, cleaning rifles, performing a hundred tasks