dropped a shell on the roof, and it blew the mill right down into
the ground, and us with it. We're in the cellar--or what was once the
cellar."

"And the next question is, how to get out," added Bob.

"Hark!" exclaimed Jimmy, holding up a warning hand.

There was silence, broken by a faint, crackling noise.

"Do you think you hear the German guns, or ours!" cried Bob.

"Neither one," said Jimmy, and there was a curious note in his voice.
"What I hear--and what you'll all hear, soon--is the crackling of
flames. The old mill--or what's left of it, boys--is on fire!"

"Then let's get out!" yelled Roger.

Jimmy looked about him, without moving. Above them there seemed to be
a solid mass of torn beams and jumbled masonry. On either side there
were stone walls--cracked walls, it is true, but, nevertheless, too
solid to admit the passage of the Khaki Boys. And only on one side
was there an opening, but this was so choked with debris as to make
it seemingly impossible to make egress that way. And, as the young
soldiers stood there, trapped under the collapsed mill, the sound of
the crackling flames became more plain. They could smell, now, the
smoke of burning wood.

"We've got to get out! We've got to get out!" yelled Bob.