"We need a rear guard to protect us against surprise," said Captain McLain, and after what had gone before it seemed but natural that Corporal Martz and Private Mullen should be selected for the job when they promptly volunteered. With little further adventure the party arrived in the regimental lines after about thirty-six hours of almost continuous contact with the Germans. In each regiment the survivors of this first real battle of the troops of the Pennsylvania Division were formed into one company for the time being, until replacement drafts arrived to make up for the heavy losses. This, then, is the tale of what happened when, as so many soldier letters have related, these four companies were "cut to pieces," and this is why L and M companies, of the 109th, and B and C companies, of the 110th, figured so largely in the casualties for a time. CHAPTER V THE GUARD STANDS FAST Back in the regimental lines, while the four companies were being mauled badly by the Germans, anxiety had gone steadily from bad to worse. Enduring the storm of shells with which the Germans continued to thresh the back areas for miles, the troops did not have, for some time after the battle began, the excitement of combat to loosen their tight-strung nerves. They saw the French come filtering out of the woods before them, and watched eagerly for their comrades, but their comrades did not come and, as time passed, it was realized the detached companies were having a hard time. The vanguard of the Prussians reached the edge of the woods shortly before daybreak. Men on watch in the American trenches saw hulking gray-clad figures slinking among the trees close to the forest's fringe and opened fire. As the day grew the firing on both sides waxed hotter, and soon a long line of the enemy advanced from the shelter of the bois. They were met by a concentration of rifle, machine gun and cannon fire such as no force could withstand. The first waves seemed simply to wither away like chaff before a wind. The following ones slackened their pace, hesitated a moment or two then turned and ran for the timber. From that moment, our men were themselves again. They saw the Germans were not invincible. They themselves had broken up a Prussian Guards' attack. All their confidence, self-reliance, initiative, elan, came to the fore. They felt themselves unbeatable. But one swallow does not make a summer, nor does one repulse of an enemy make a victory. Time after time the Germans returned to the assault. Groups of them gained the wheat fields, where they felt protected from the fire of our men. Obviously, they expected to crawl through the wheat until they were on the southern edge of the fields, where, lying closely protected, they could pick the Americans off at leisure.