s not damaged by the explosion."

"But," exclaimed Joe, "the German trenches! We don't want to go there to
be captured again."

"Have no fear," said the Frenchman, with a smile. "I should, perhaps,
have said what _were_ the German trenches. They are now held by some of
your own troops--the brave Americans!"

"They are?" cried Charlie.

"That is true! You shall see!"

"Hurrah!" cried the moving picture boys, and their fears and weariness
seemed to depart from them in a moment.

"The great airship raid was a success," went on the Frenchman. "Our
troops and yours have made a big advance, and have captured many
prisoners. They would have had Labenstein, but he is beyond prisons now.
Let us go hence! Even dead I can not endure his company. I suffered much
on his account."

"Well, things are happening so fast I don't know which to begin to think
of first," remarked Joe. "But, on general principles, I presume it's a
good thing to get out of this tunnel. Come on, boys."

"One moment," interposed the lieutenant. "Perhaps you will like to take
these with you."

He stooped and lifted a pile of trench bags, and the boys saw the boxes
of moving picture films.

"Ours?" cried Joe.

"None else," answered the Frenchman. "I trust you will find them all
right."

"Not a seal broken!" reported Charlie, who had quickly examined the
cases. "This is great!"

Together, hardly able to believe their good luck, they made their way
out of the log-protected room--once a German bomb-proof dugout. As they
emerged into the trenches, carrying the films, the boys saw American
soldiers.

"The Stars and Stripes!" cried Charlie, as he noted the United States
flag. "Now we're all right!"

"Whew! We did make some advance!" added Blake, as they saw how the
battle lines of the French and Americans had been extended since they
had crawled into No Man's Land the night before.

The boys learned later that the airship raid was the forerunner of a big
offensive that had been carried out when they were held prisoners and in
the tunnel. The Germans had been driven back with heavy loss, and one of
their ammunition dumps, or storage places, had been blown up, which had
caused the collapse of the tunnel.

That the moving picture boys were welcomed by the soldiers, among whom
they had many friends, goes without saying. And the recovery of the
films was a matter for congratulation, for they were considered very
valuable to the army.

"Though it wa