under fire?"

"I don't know just what you would call it," said Zaidos laughingly, and
proceeded to tell the doctor how they happened to be in their present
position.

"Well, well, well!" said the doctor. "You ought to do! First drowned,
and then shot at, and submarined. It does seem as though you ought to
be able to keep your head, with only a few simple bullets and gas bombs
flying around."

He got to his feet stiffly, for living underground makes men rheumatic,
and put down his paper.

"Just pay attention," he said in a crisp, business-like way. "When you
serve wounded men, remember two things. Work deliberately, yet with
the greatest speed. Many a man has died from one little twist given in
getting him on his stretcher. Forget the fight, forget everything for
the time but that the torn body is in your hands. Do you know anything
at all about lifting a man?"

"I do," said Zaidos. "I'm a Boy Scout. Besides, we learned all that
at school."

"Good!" said the doctor. "All you have to do is to remember what you
know, when the necessity of using your information arrives. When you
have your man on the stretcher, get here as soon as ever you can.
Don't wait for anyone; private and General alike must stand aside for
the Red Cross. Wonder if you could stop a cut artery?"

"Yes, sir," replied Zaidos.

"How?" said the doctor, reaching out his arm. Zaidos took it and
demonstrated the thing and the doctor gave a grunt of satisfaction.

"When you get your man here, lay him down on one of the benches or on
the floor or anywhere else that you see a place for him. Don't wait,
for we will attend to him after that."

"Yes, sir," said Zaidos. He foresaw lively times.

"Good morning," said the doctor, sitting down and taking up his
precious paper. The boys went out, feeling as though they had been
dismissed from class.

The large cook house was very close to the First Aid Station, and was
equipped with wonderful field stoves and great kettles and pots. A
number of cooks were in charge, and the boiling soup smelled good
enough to eat!

Three zig-zag trenches led from the cook house and First Aid Station to
the second line of trenches.

Here was a repetition of the first line trench, machine guns and all.
Back of it stretched a line of snipers' trenches, and behind them
another barbed wire entanglement. A tunnel led under this; several of
them in fact, and large enough to permit the passage of a number