"You might have been killed." "No such luck," he muttered in reply, but the girl could see that he trembled slightly with nervousness.

Neither realized at the time the fatal folly of the act, for they were unaware that the Germans were seeking just such a clew to direct them where to drop their shells.
"It's getting rather lonely here, and there are a couple of vacant hollows in front of us," remarked the doctor.

"Suppose we move over to one of those, a little nearer the soldiers ?" Patsy approved the proposition, so they gathered up their supplies and moved along the hollow to where a passage had been cut through.

They had gone barely a hundred yards when a screech, like a buzz-saw when it strikes a nail, sounded overhead.

Looking up they saw a black disk hurtling through the air, to drop almost where they had been standing a moment before.