But here at last they were at the place where the smaller road left the main one, and entered the country burial grounds.
How fortunate that they had made all their arrangements beforehand! What if the mending of the leaking reservoir had been left until their return with Helene! Small chance they would have in that case of effecting their escape with the aroused Hun soldiers scouring the country in search of them.
Just then another thing came to pass that caused Jack's heart to feel as though a cold hand had been pressed down on it. From above came a familiar sound, especially to the ear of an aviator. It was the unmistakable buzz of an airplane motor. The sound was growing constantly louder, as though the machine were heading directly toward the chateau.
Of course it was next to imposible for it to be an allied plane; and so Jack must conclude that it bore some courier sent from Hindenburg's headquarters, wherever they might be, with a message of vast importance meant for the general commanding the sector opposing the American advance. Tom and Jack exchanged looks. It seemed as though they were now between the upper and the nether millstones. If they lingered where they were the soldiers were almost certain to come upon them; and should they choose to
