saving what they could, that their fire against the hostile airships noticeably slackened.
"Any more bombs left, Jack?" asked Tom.
"A few," answered his chum.
"Let 'em have it now. We're right over a big building that seems to be untouched."
Down went the bombs, and such an explosion resulted that it could mean but one thing. They had set off a munition factory. This, as the boys afterward learned, was the case.
So great was the blast that the great plane skidded to one side, and a moment later there came a cry of alarm from some of the crew.
"What's the matter?" shouted Tom.
"Out of control," was the answer. "One of the motors has stopped, and we've got to go down."
"Can't we go up?"
"No!" was the despairing answer. "We've got to land within the German lines."
And down the great Italian plane went, while her sister ship of the air sailed safely off, for it would have been foolhardy for her to have tried to come to the rescue.
The crew worked desperately to send their craft up again, but it was useless. Lower and lower she went, fortunately not being fired at, so great was the confusion caused by the destruction of the factories.
