aps they were even chained there,
as frequently happened.

In consequence they had to cower under their shelter and wait until,
later on, without warning, there would come loud shouts from the front,
and when they craned their necks to catch the first glimpse of the foe
shots from the rear would clean up that nest.

Morgan started with his signal work immediately after they had climbed
to the proper altitude, where they might work without being in too great
danger from the "Archies," or anti-aircraft guns.

As soon as he had a response, and knew that his directions were
accurately noted, he announced the fact to Jack. They were then ready to
begin all over and start "fishing" again.

It was very exciting work, and Jack Parmly gloried in it. Though he had
to take additional chances in order to tempt the Hun gunners to betray
their cunningly arranged coverts, there was also a satisfaction in
knowing that by so doing he and his assistant were saving many precious
lives of the infantry regiments down in the forest that had proved a
graveyard for thousands.

A second time did they get a "bite." Again was the retreat conducted in
the midst of a rattling volley, with hurtling missiles burning the air
all around them, as well as beating a lively tattoo on the armored parts
of their plane.

After that they flew higher, in the hope that some enterprising Boche
flier, seeing their challenge, would come over to give them battle. For
half an hour, they kept this up, and then, as they tempted forth no
adversary, determined to drop down once more and root out a third nest
before going in for the noonday meal.

"They're at it hammer and tongs to-day for fair!" called out Morgan, as
he used his binoculars and picked out spots far below where there seemed
to be open fighting going on. He could discover bodies of German troops
being rushed forward and then falling back with decimated ranks before a
fierce flame of shot and shell poured in by Yankee batteries.

"Getting desperate, that's what!" announced Jack, starting a dip that by
stages would take them down once more into the dangerous quarter of
treetops under which lurked the deadly foe with his thousands of
rapid-fire guns.

Other planes were in sight here and there, carrying out similar tactics
with more or less success, according to the daring of the pilot in
tempting the Huns beyond their power to resist. Jack determined to pass
further on and see what he could unearth