"We have discovered some of these entrances," he continued, "but
immediately they have changed. At present we do not know them. But at
10 o'clock tonight the points from which the German reserves will
emerge must be instantly and accurately marked. When our infantry goes
over the top and the Germans order their shock troops out from the safe
underground refuges to meet our men, we must know the points where the
enemy battalions are coming up. Some of these points will be cared for
by French already in position to inform us. I offer to you the
opportunity of marking others of those points."
"We shall be glad," said Hal simply.
"Very well. You understand, of course, that you will be killed if
discovered. Both of you come with me."
He arose, and Hal and Chester followed the captain to his motor-car,
which they entered and drove to the main road, over which German
prisoners captured early in the day were still streaming to the rear.
Overhead a few aeroplanes still buzzed -- combat and fire control and
staff "observation" machines seeking out their aerodromes in the
dark.
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