Jumbo was leading, and close behind followed the boys of the old Thirty-seventh, with Frank and his chums in the van. They were fighting like young Vikings, their rifles empty but their bayonets and hand grenades doing deadly work. Their arms were tired by their terrific efforts, but their hearts were on fire. They felt as though they were treading on air, and the blood ran through their veins like quicksilver. Bunker Hill and Gettysburg spoke through them. The traditions of a hundred glorious battlefields on which Americans had fought was theirs. Now again Americans were fighting, fighting to avenge the murdered women and babies of the Lusitania, fighting to crush the most barbarous tyranny the modern world has known, fighting the battle of freedom and civilization. So they fought on like demons, smashing a pill box here, routing out a machine gun nest there, until the second line was carried. Then the conquerors paused for breath. On the whole German front in that region two lines deep the line had been smashed. That crowded hour of stark fighting had cracked the boasted invincible line of Hindenburg and sent the foe flying in confusion toward their third and most formidable line. Thousands of prisoners and scores of guns were among the spoils of victory. And the most gratifying feature of the drive was the insignificant loss to the Allied forces. The resistance at first had been only slight, and even in the second phase of the battle it had been so quickly overcome that few of the attacking troops had fallen. Seldom had so great an advance been made at so small a price. But modern warfare has its limits in the matter of time and speed. The very swiftness with which they had advanced had in itself an element of danger because it had brought them too far ahead of their supporting guns. These had to be brought up from the rear, and the captured positions had to be reorganized. The troops, too, had to be given a breathing spell, for they had reached the limit of human endurance. So a halt was called, and the wearied men took turns in resting and refreshing themselves for the hard work that still lay ahead of them. "A mighty good morning's work," panted Frank, as he threw himself down at the roots of a giant tree which had been utterly stripped of branches and even of bark by the tempest of fire that had raged around it. "Ask a German and see if he'd agree with you," said Billy with a grin. "We've got plenty to ask," said Tom, as his eyes roved over the throng of prisoners. "We sure have taken a raft of them this morning. And there's a still bigger bunch that will never answer roll call again." There was food in plenty, but they did not have to avail themselves of the rations they carried in their kits. There were the camp kitchens of the enemy that in a twinkling were set to work, and soon the savory odors of steaming stews and fragrant coffee filled the smoke-laden air and brought joy to the hearts of the victors.