"He has always done that, no matter in what part of the world he has been called into action," said Hal. "Take the troubles in Nicaragua, San Domingo, and even at Vera Cruz, when it seemed that we must wage war upon that country. The marines were always first on the job, and from all accounts they cleaned things up wonderfully well." "Well," said Chester, "we have talked to you fellows too long now. We've work to do, and I suppose you have also. It's time, Hal, that we reported to Captain O'Neil. He may have something in sight for us. We'll see you fellows again soon, I hope." "Thanks," replied Lieutenant Smith. "I am sure we hope so, too." The four shook hands all around and Hal and Chester a few moments later, learned to what extent the German general staff appeared willing to go in their efforts to drive a wedge between the French and British lines and then execute a flanking movement upon the French capital itself. "We've our work cut out for us the next few days, and possibly weeks," the American captain told the two lads. "Just listen to the roar of those guns. You boys have been in this war almost four years, but I'll venture to say you have never heard the like before." It was true. Never, so far as Hal and Chester could remember, had the fire of the heavy German batteries been so terrific. The very earth quivered under their feet from the shock. While the Allied artillery was returning the German fire, the guns had not been concentrated upon the foe's positions; but the activity of the French, British and American artillery was soon to equal that of the enemy and the two, combined, were speedily engaged in what was to prove the greatest artillery action in history. All day long and into the night the great guns pounded on without cessation. Hastily, under the personal direction of divisional commanders, American, British and French troops strengthened their positions that they might be better able to repel the foe when the infantry advanced to the attack under cover of the heavy German barrage. All day long and far into the night Hal and Chester rushed hither and thither within the lines with orders. Now, an hour after midnight, they found themselves for the first time with nothing to do. "Whew!" said Hal, as he sat down on the edge of the dugout to which they had been assigned. "This has been the busiest day I have put in in months." "Here, too," Chester agreed, "and I'll bet a hat that to-morrow and the days to follow will be just as bad." "Wouldn't be surprised," declared Hal. "It's only a matter of hours now until the Germans advance to the attack." "Well," said Chester, "we're prepared for them. They'll know they've been in a battle before they break through here." "Right. The thing that I am trying to figure out is just about how many men von Hindenburg is willing to sacrifice in what I believe will be the last enemy offensive on a large scale."