The information which they had gained through tapping the enemy's wire enabled the American and French troops, operating together, to prevent the German trick from being carried into effect. More than that, it enabled them to turn the knowledge of those plans to such good advantage that the allied brigades swept forward in terrible force against the weakest points in the enemy line. They pushed the whole Boche front back for more than a mile--at the very point where it had been considered strongest! As a consequence, the point of communication which the lieutenant and his aides had established with so much difficulty was now well within the territory held by the American and French fighters. The requirements for a further advance now made it necessary to have another outpost point of communication as near to the enemy trenches as the first one was before the day's battle put the Allies a mile further forward. And so, except for Tom Rawle, who was resting easy from his hip wound, the same party started out at the same tune for the same purpose on this second night, but with a very much sharpened realization of the obstacles they had to overcome and the chances they faced of being wounded or captured. "We take an entirely different direction," Lieutenant Mackinson told them, as he looked up from the map he had been studying. "We go to the north and east and as close to the observation trenches as possible." Now the danger of this can readily be seen from considering what an observation trench is. The front-line trenches of the opposing armies, of course, run in two practically parallel lines. But an observation trench runs almost at right angles with the front-line trenches, and directly toward the enemy trench, so far as it is possible to extend it. The extreme ends of these observation trenches are known as "listening posts," and often they are so close to the enemy lines that the men in the opposing army can be heard talking. Lieutenant Mackinson and his aides, Joe, Jerry, Slim and Frank Hoskins, were to get their signaling location as near to an enemy listening post as possible! In other words, they were to court discovery in an effort to get just a few feet nearer the enemy than they otherwise would. They went along much as they had on the preceding night, except, had there been light enough, it might have been noticed that Slim, in his walking, pushed his feet forward cautiously, and then in stepping lifted them high from the ground. But as luck would have it they had not gone more than two hundred yards when a bullet whizzed within two feet of Jerry's head, followed by a shower of missiles that were directed entirely too close to them for comfort. Instantly they dropped flat on the ground. In the distance ahead of them they could see three shadows stealthily crawling along toward them. "Pick your men!" Lieutenant Mackinson ordered, in a whisper. "Fire!"