complished in the battle, and were anxious to pull out.

As if a concerted signal had been given, the three Gothas were soon in
retreat. No doubt the sight drew many a hoarse, derisive yell from
watching Americans below, who could not understand the feeling of
extreme caution that would tempt an air pilot to turn tail and run for
home when opposed on equal terms.

They made excellent speed, too, and after chasing them for a short
distance the Americans turned back. There was work much more important
awaiting their attention just then than following the fleeing Boche
fliers to some spot, where possibly a swarm of their mates would be
turned loose to cut off escape and bring the daring Americans down.

One of the two friendly machines that had so opportunely come to the
relief of Jack and Morgan now approached. To the delight of Jack he
recognized in the muffled figure waving a gloved hand at him no other
than Harry Leroy.

"A bunch of slick runners all right, Jack!" bawled Nellie's brother, as
the two planes passed not far distant from each other.

"They're all right when three to one!" answered Jack, as he circled in
order to keep close to the other for a brief time.

"What luck?" demanded Harry; for of course that was the one important
subject ever on their minds when thus out hunting for hidden snipers'
nests.

"Got two to-day so far," called Jack. "Then came over here looking for a
boss nest. Found it, too, down there; and we're going now to see what
our battery boys can do with it."

"Fine work, Jack! Here's wishing you luck. We'll move along and see if
we can duplicate your job!"

"Success to you!"

So they separated there, far above the seemingly endless forest where
the two opposing armies were grappling in a death grip, the one bent on
victory, the other striving desperately to put off the evil day as long
as possible, in the hope of a break in their favor.

Jack knew what he and Morgan had next to do. It was to begin signaling
to catch the attention of the observers with the American batteries,
doubtless waiting impatiently for a chance such as this, and which thus
far had been denied them.

He was at the proper altitude, safe from fire from below, and with all
enemy planes driven off. The growl of the big guns came less furiously
to their ears, so far removed from the ground were they. The incessant
whir of the Liberty motor that had come from American shops and the buzz
of the propellers render