und up the spies. You know Milton says 'They also serve who only
stand and wait.' If there aren't any reserves to stand and wait behind
the lines, the men on the firing-line do not dare to push ahead. And
besides, Roy, it is seldom that four boys play so important a part in
great deeds as you four boys already have played."

"Four boys and a man," corrected Henry. "Without you we could never
have gotten anywhere," and Henry looked affectionately at his captain.

"Oh! Yes, I had a part in it," agreed the captain, "but it was only a
part."

"But you read the ciphers," protested Henry. "If you hadn't done that,
we could not have made any headway at all."

"And who caught the messages for me to decipher? The reason we have
gotten along so well is because we work together so perfectly. I want
to thank you boys for being so faithful. I've given you many hard
tasks to do."

"After our experiences at Camp Brady," said Lew, "we couldn't do
anything else than be faithful. We know by experience what happens
when we don't do our duty."

"Then you are going to listen in during the remainder of the spy hunt,"
said Captain Hardy, with an affectionate smile, "just as faithfully as
though your work weren't already done and the spice gone out of it. I
know it will be dull and uninteresting, boys, but you've made such a
fine record that I don't want you to fall down now. So be very
careful--if only for my sake."

"They've never talked once," said Henry ruefully, "excepting after the
transports sail. I don't suppose they ever will except when the ships
go out. We'll have to listen to nothing for twenty-four hours a day.
But we're going to do it just the same."

He rose and walked toward the wireless room. "It's back to the mines
for me," he added. And he disappeared through the doorway of the
wireless room.

But hardly had he sat down and clamped the receiver to his ears before
he cried out. His fellows came flocking into the room. Henry was
swiftly writing a string of letters on a sheet of paper.

"Something of moment must be afoot," said Captain Hardy, in a low
voice, "for them to be talking at this time. It must be important,
indeed."

"It's a long message," whispered Willie, as Henry continued to fashion
letter after letter.

"Something tells me it is important," repeated Captain Hardy. "What
can it be? You don't suppose the secret service men have alarmed them,
do you?"

Henry finished his writin