Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret

Jack hardly knew what to do. He made threatening gestures at the dog, but they, of course, only added to the trouble, for the animal renewed his barking more briskly than ever.

"Tom, sit down here on this bench, won't you? I want to have a little talk with you about some things that have bothered me a whole lot lately," said Jack, some days after the e...

"Open it, Jack, and see what the message is," urged Tom, as his chum stood with the scrap of damp paper held between his fingers, having allowed the sagging little toy balloon t...

What Jack said in his cautious fashion puzzled Tom. For the life of him he could not understand what had arisen, calling for any unusual display of generalship. Surely Jack shou...

"As for me," spoke up Bessie, immediately, just as Jack felt positive she would, "I'd like nothing better. I've been up once in a hydro-airplane, and would have gone many times...

Neither of the air service boys had any doubts now with regard to the character of the grounds they were invading at dead of night. It must be a private estate. Once it may have...

"Yes. He seemed to go out of sight like a wreath of smoke does. Why, if the ground had opened and swallowed him up, once the hue and cry was raised, he couldn't have vanished qu...

"I say, Tom, it looks like a poor day for flying I'm afraid," Jack called out in the chill of the early dawn the next morning, he having been the first to get out of bed and ste...

The time for talking had passed. With the motor working noisily, and the twin propellers churning the air, they could hardly have heard the discharge of one of the 'Big Berthas'...

"What do you call this, Tom? A queer sort of crow, I'd say. Looks more to me like the blue-rock pigeons Sam Becker used to raise at home," and so saying Jack held up the still q...

What followed that first heavy detonation was very much like a riot. The audience became frantic under the belief that it meant an attack on the town, and that the missiles woul...

Those were the expressive words that broke from Tom Raymond's lips when he saw the commander give him the long-anticipated signal. Tom had already discovered his intended antago...

Carl Potzfeldt had again entered the house and closed the door; and the air service boys could no longer hear the car speeding along the road. Jack was quivering all over with e...

The girl showed considerable nimbleness in climbing over the window-sill. Jack insisted in having a hand in dropping her slowly down. It was not far, and in a few breaths the gi...

Both of them listened. Peculiar sensations crept over them as they stood and thus strained their ears to catch any further sounds. Sobbing at any time is enough to arouse the fe...

While the fighting on the Verdun front was furious at times, with prolonged spasms when the Germans seemed determined to recover the territory they had lost to the French, there...

Both young aviators stared at the wicker cage containing the two pigeons. The birds had been still up to then, but now commenced to make cooing sounds, as though pleased at havi...

"Guess that Potzfeldt must know that planes can drop down on his big open field," the youth muttered to himself. Then as a new idea flashed through his brain he continued: "Whee...

By the time the pilots of the American escadrille began to assemble on the field where the airplane hangars were clustered, (these being more or less camouflaged by means of pai...

Tom had his hands full in trying to get back to his course again. Naturally, in the excitement attending the duel in midair he could not pay attention to where he was going. It...

"My time is limited, I regret to say, my gallant Americans, or I should gladly ask you all manner of questions concerning your own country. We are all anxious to know when the g...

"Just see the fiendish cleverness of the fellow who filed that stay!" Tom cried, as they all stared. "He filled the indentation his sharp file made with a bit of wax or chewing-...

It had been a close call for the two air service boys. Had they been delayed just a minute or two longer escape might have been impossible. And to have been caught with the spy'...

The two air service boys fell to talking earnestly concerning what they should take with them, and how to study a map which their captain had promised to put in Tom's hands imme...

During all this turmoil the fire-control plane pilot had kept his machine at work. While the fighting guard engaged the German, the observer aboard the larger craft continued to...