"Haven't any idea," replied Colonel Anderson.
"Well, you can take my word for it they are up to some mischief," declared Chester. "This silence bodes no good for us, I'll bet."
"Well, as long as they let us alone, it's a point in our favor," declared Colonel Anderson. "It is less than an hour until daylight now. Then we shall have help."
"The Austrians will have a whack at us before that," said Hal positively.
"But I would like to know what's up."
"So would I," declared Chester. "And I am positive that there's something."
"I guess we'll know soon enough," said Uncle John.
And they did learn—not fifteen minutes later.
"What's that funny noise out there?" asked Chester suddenly.
The others strained their ears.
"I don't hear anything," said Hal. "You must—Wait, though. What is that noise?"