Since they had been in France, the boys had had special training in scouting duty, and the one thing that had been drilled into them perhaps more than anything else was the necessity for "playing dead," as Tom expressed it. One of their exercises compelled them to lie on the ground absolutely motionless for an hour. Not even a muscle could twitch without bringing a reprimand from their keen-eyed instructor. Another part of the drill made them take half an hour merely to rise to their feet from a prostrate position, each move in the process being marked by the utmost caution. It was hard drill, but necessary, and in time the boys had gained a control over their muscles that would have done credit to an Apache Indian. In a few minutes they were fully arrayed in their crawling suits and reported to Corporal Wilson. He looked them over carefully and noted with satisfaction that nothing that was essential to the success of their night foray was lacking. "With a fair share of luck we'll bring home the bacon," he remarked, as he led the way from the trench. At the start there was no special caution necessary, as would have been the case the day before. For the two trenches in front of them that had been occupied by the enemy were now in the possession of the United States troops. All that day, since the mine explosion had given the signal for attack and storm, the Germans who had been driven from their first two lines of trenches had made desperate efforts to get them back. There had been fierce counter attacks, many times repeated, but through them all the Americans had stood like a rock and thrown the enemy back without yielding a foot of the conquered ground. At nightfall the enemy had ceased his infantry attacks, although the big guns on both sides, like angry mastiffs, kept growling at each other. "It's been a great day for our fellows," exulted Frank, as they picked their way through the welter of debris that bore testimony to the violence of the fighting. "It sure has," agreed Bart. "We've got there with both feet," remarked Tom. "And in both trenches," chimed in Billy. "Yes," said Frank. "I'm glad we didn't stop at the first one. The mine caught the Boches napping there and stood them on their heads. But in the second it was an out and out stand up fight, man to man, and we licked them." "And licked them good," asserted Billy. "I guess they won't do any more sneering at the Yankees after this day's work." They passed the place where Bart had so nearly met his death through the treacherous attack of his captive. "Here's where you nearly went West," remarked Tom. "Don't talk of it," objected Bart with a grimace. "It makes the chills creep over me to think of it. I could stand being knifed in a square fight, but I'd hate to get it the way that fellow meant that I should."