e of men and guns.

And through it all, though they did not for a moment neglect their duty,
bearing in mind their instructions to keep in contact with the batteries
they served, Tom Raymond and Jack Parmly were eagerly seeking for a
sight of the prison where Harry Leroy might be held. At one time after
they had dropped bombs on some German positions, thereby demolishing
them, Tom, who was acting as pilot, signaled to his chum that he was
going far over the enemy's lines to try to locate the prison.

Jack nodded an acquiescence. It was not entirely against orders what
they were about to do. They might obtain valuable information, and it
would take only a short time, so speedy was their machine. Then too,
they had used up all their bombs, and must return for more. Before doing
this they wished to make an observation.

Luck was with them. They managed to pass over a comparatively quiet
sector of the lines where the German resistance had been wiped out, and
where, even as they looked down, Americans were digging in and guns were
being brought up to support them.

And not many kilometers inside the German positions from this point,
they sailed over a prison camp. They, knew it in an instant, and felt
sure it must be the one spoken of by the German who had taken Leroy's
gold and then betrayed him.

"That's the place!" cried Tom, though of course Jack could not hear him.
"Now to bomb it and set Harry free!"

But they must return for more ammunition, and this they set about doing.
They wished they might drop some word to the prisoners confined there,
stating that help might soon be on its way to them, but they had no
chance to send this cheering word.

Back they rushed to their own lines, and no sooner had they landed than
an orderly rushed up to them and instructed them to report immediately
to their commanding officer.

"Boys, you're just in time!" he cried, all dignity or formality having
been set aside in the excitement of the great battle.

"What is it?" asked Tom.

"We want you to silence some big German guns--a nasty battery of them
that's playing havoc with our boys. The artillery hasn't been able to
locate 'em--probably they're too well camouflaged. And we can't advance
against 'em. Will you go up and try to put them out of business?"

Of course there could be but one answer to this. Tom and Jack hurried
off to see to the loading of their machine with bombs--an extra large
number of very powerful ones bei