"We didn't know what these marks meant," he explained. "So we decided to try to find out. And when we reached the place that was marked on this map we found not only a concrete and steel foundation for a big gun, but some smaller guns, all ready to be assembled and a store of ammunition."

"Tell me exactly what happened," said du Chaillu. But already he was comparing the sketch maps Paul had given him with his own big wall map, and was using his compasses and other instruments to determine ranges and distances. His eyes were shining, too. Busy as he was, however, he listened attentively.

"That was well done—well done, indeed!" he said, heartily. "You will hear more of this, I promise you, and from those whose praise will mean more than anything I can say. I shall take you at once to General Leman, although there are positive orders that he is not to be disturbed."

And so in a few minutes they found themselves in the presence of the heroic defender of Liege, the kindly faced, middle aged general who was to win a European, a world-wide reputation, indeed, in the course of the next few days. He heard du Chaillu's report; then he questioned both the scouts.

"You have served Belgium well to-day," he said, finally. "I shall report your conduct to His Majesty the King. Major, see to it that these boys reach their homes in safety, and if an escort is needed, or any other help, to enable them and their relatives to reach a place of safety, supply it. I shall see you again, I hope, my boys!"

"What we discovered will really prove useful, then?" asked Paul, when, with the major, they had left General Leman.

"Useful?" exclaimed the major. "Eh—but yes! Listen! What you have found is the location of all the heavy guns that will soon be thundering at our brave forts. Now we shall know just where those guns are. We can give the gunners the exact range, the exact spot at which to drop their shells. We shall put their heavy pieces out of business. Do you see? If you had not brought us this word we might have wasted many shots trying to do that. We should have sent up aeroplanes, we should have guessed by the smoke and the reports just where their guns were placed. But now we need not guess; we need risk nothing to learn the truth. We know it in advance."

"I was hoping there would be time to send men to destroy such places as we found," said Arthur.

"There might be time, but it is far better not to do so, you see," said the major. "As it is, we could destroy only the mountings. But if we wait until their guns are in position, we can smash the guns as well. It may well be that you have dealt a blow to Germany to-night more severe than the loss of a battle and fifty thousand men would be!"

"I hope so!" said Arthur, vindictively. "They have no business coming into peaceful Belgium, which asks only to be left alone!"