He held up a hand, which told Chester that something of importance was
going on.

"All right, general," said a voice in the German trenches, which was
carried plainly to Hal's ear by the Dictaphone.

"Stay!" came another voice. "You will also order Colonel Blucher to
open with all his guns at the moment that General Schmidt's men advance
to the attack."

"At midnight, sir," was the reply.

"That is all."

The voices became silent.

Quickly Hal reported to Chester what he had overheard.

"It's up to us to arouse Captain O'Neill," said Chester. He hurried
off.

Hal glanced at his watch.

It was 10 o'clock.

"Two hours," the lad muttered. "Well, I guess we'll be ready for
them."

A few moments later Captain O'Neill appeared. He was in command of the
Americans in the first line trenches. These troops were in their