"But if we sound it they may make up their minds that we're all right--and I'm not anxious for them to get curious about us." So he sounded the bugle from time to time.

They aroused no curiosity.
Plainly these sentries thought there was nothing strange about the passage of a military automobile, nor, in fact, was there.

It was not likely that they would know enough of the general disposition of the German army to speculate as to what officers might be doing hereabout.
"Here we are! We're beginning to dip," said Boris, after a time.

"The culvert Ivan spoke of must be at the bottom of this hill.

The road gets away from the railway again after that, and when we have passed there we ought to be all right." "There's just one thing," said Fred, with a frown.