Jack understood that there were several reasons for having Tom do this.
In the first place his work on the chart would familiarize the young aviator with its every detail, and fix things firmly in his mind. Then again, if they were lost, and never returned, the priceless chart for night voyaging over the enemy"s lines would be at least safe.
Daring men had gone forth on similar desperate errands before then, and had never been heard from again. It is the fortune of war. Those who indulge in enterprises that border on the sensational must always expect to sup with deadly peril.
When the evening meal was announced the two chums were already deep in the work. Of course not a whisper of their intended mission was breathed at the table. No one dreamed of their contemplated trip. The customary chatter and good-natured badinage flowed during the whole supper-time.
While some of the American aviators had received wounds in recent engagements there had been no chair vacant for some little time now; and hence no gloom rested on the escadrille. From the table the boys again went to their room.
"How far is Metz from Verdun?" asked Jack, as they labored to complete their preparations for departure.
"Not over forty miles, I should say, as the crow flies, Jack. I"ve never been over the route, but it can be measured on this copy of the map."
"And that"s the direct line we expect to cover, of course?"
"We"ll head due east."
"And as it"ll be densely dark when we start I guess we needn"t mount to ten thousand feet to pa.s.s over the enemy lines, eh, Tom?"
"There"ll really be little need," came the reply, showing that the pilot had already figured all this out. "At the same time we ought to keep far enough out of range to avoid being struck by stray shrapnel."
"Will they bombard us, do you think?" demanded Jack.
"Oh, that"s to be expected," said Tom indifferently. "You see the men who man the anti-aircraft guns are constantly on the alert. They"re bound to hear the whirr of our propeller as we pa.s.s over, no matter how high we soar. The searchlight will spot us out, and then they"ll do their best to make things uncomfortable for the pair of us. But the chances are ten thousand to one against our being hit."
"You said our course would be due east, didn"t you?"
"I"ll change that a.s.sertion a bit, Jack; we start east after we"re well across the front, and away from the dazzling searchlight business. In the beginning we"ll point the nose of our big machine toward the north."
"So as to deceive the watchers, of course," remarked Jack.
"That"s what the game is."
Jack"s eyes sparkled. He was always proud of his chum"s clever reasoning powers, and believed Tom could hold his own with any one with regard to mapping out a promising plan.
Their preparations completed, the two air service boys lay down to secure a little rest. As they were not to start until some time after midnight, Tom believed they should secure a few hours of sleep. The moon was a late one, and would not rise, even with a midnight start, until they were well back of the enemy lines.
An alarm-clock aroused them at the appointed time. Tom immediately shoved the noisy thing under his blankets before it could wake up the entire house, and set people wondering what was happening that any one should want to be aroused at such an unseemly hour.
It was terribly black outside. Jack pressed his nose against the window and took a look, even while hurriedly finishing his dressing. Tom had taken the precaution to put a fresh battery in his little hand electric torch, which he believed would prove to be worth its weight in gold.
Arriving at their destination, the boys quickly found their two-seater aircraft awaiting their coming. Quite a crowd stood around, and made guesses concerning the possible reason for the captain"s order that this plane should be made ready for a journey, with enough supplies of gasolene and oil aboard to cover any ordinary emergency.
Tom took no chances. He believed the attendants had faithfully carried out all directions, but to make doubly sure he looked over things himself. It was his life and Jack"s that were at stake, and not those of the attendants; so he persisted in testing this and that thing until he felt certain everything was as it should be.
"Is it time we started, Tom?" asked his companion, when this procedure had resulted satisfactorily.
"We"ll wait just ten minutes more," he was told. "I"ve figured everything down to a fraction, and expect to proceed by clock-work. We want to be well over the line before the moon peeps up. After that we can loaf a bit, and let the old lady get a little way above the horizon.
That"s so we may have the benefit of her light when we want to land."
The minutes pa.s.sed slowly. Meanwhile the crowd increased, every man who chanced to be abroad at that hour of the night gathering to see the two Americans start on their mysterious errand. All sorts of guesses were indulged in, many of them of the wildest character. Jack hearing some of this talk, which he half understood, was convulsed in silent laughter over the remarkable ideas that seemed to possess the minds of those French mechanicians and hostlers.
Finally Tom stood up.
"It"s time!" he said simply, and Jack understood without any further explanation. He at once proceeded to climb into his seat and complete his simple preparations for the work in hand, being already fully dressed in his fur-lined garments, and with his warm hood and goggles in place.
A minute afterwards Tom called out the word that started the propellers whirling. The motor took up the refrain, and hummed merrily, as though glad to be busy again. Then they were pushed along for a start, gathering momentum so quickly that the mechanicians dropped back to watch the dark object vanish almost wholly from their sight along the level field.
Both boys noticed the great difference between this two-seater and their own active little Nieuports. How clumsy this machine was, and how slow to answer to the call of the pilot! Yet it would be far better for their purpose than two of the small aircraft, since it allowed them to be together.
The few lights of the aviation field near Bar-le-Duc had faded almost entirely out of sight by the time Tom turned to the north and headed for Verdun. True, he might have pointed the nose of the airplane directly east, and saved considerable distance, but there were good reasons for not doing this.
To cross the German lines further south would surely convince the Teutons that the aviators were heading for the vicinity of Metz, which was just what Tom did not wish to have happen. Then again, his chart covered only the direct line between Verdun and the fortified city of Lorraine that forty-odd years back had been French territory, before the Germans seized it as spoils after the war that made France a republic for the third time.
CHAPTER XV
THE MOONLIGHT FLIGHT
The time for talking had pa.s.sed. 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", as the Allies were wont to call the monster Krupp guns, and so called them because a woman whose maiden name had been Bertha Krupp, owned a big interest in the works where they were manufactured.
All was dark around and below them. Above the stars shone, and gave a small amount of cold, cheery light. Tom had made a study of the heavens, and was able to steer by means of the stars. The aviator is often as much dependent on compa.s.s and heavenly bodies to shape his course as the sailor hundreds of miles away from land.
Tom was in no especial hurry. He had carefully thought out his plans, and meant to pa.s.s over Verdun at just a certain time. Then would come the two lines of hostile trenches, and the ordeal of searchlights and shrapnel. Once that was done with, they had really little further to fear.
The minutes slipped away. Under ordinary conditions they were accustomed to making that thirty miles in just about half that number of minutes, thanks to the ability of the speedy Nieuports to cover distance. It would be twice that now before they would find themselves at the front.
Already they could see various signs to tell them they were drawing near. Rockets used as signals of various kinds ascended at intervals, and burst. Others of the star variety, and which discharged glowing white electric b.a.l.l.s that lighted the earth below, could also be seen.
One side or the other apparently had some reason for desiring to scrutinize a special sector of terrain in No-Man"s-Land, the disputed region lying between the hostile trenches.
Jack used his eyes to advantage. These things had not yet grown stale with him, for he still found himself filled with awe and wonder when gazing down from a lofty height at the world shrouded in darkness below.
There within a comparatively short distance, that might not be over twenty miles, a round million of soldiers were gathered, armed with numberless engines of destruction of the most ponderous nature imaginable. It was enough to give any one a genuine thrill, and Jack felt such a sensation creeping over him.
The crucial time had now come. They were pa.s.sing over the line of the French trenches. Jack knew this from various signs, and also that in another minute they might expect to be spotted by some of the enemy searchlights. These would be unmasked, and trained on the heavens in the effort to locate the cause of that well known clattering noise above.
This speedily came about. First one long shaft of dazzling light rushed back and forth; then others joined in the hunt, until presently they focussed on the progressing two-seater pushing north.
Then began the bombardment. Numerous anti-aircraft guns were poking their noses upward in antic.i.p.ation of just such a call. Their crews commenced to shower the shrapnel around and below the bird of pa.s.sage, whose mission, whatever it might prove to be, could mean only evil to the Teuton cause.
All this racket was lost upon the two so far above the earth. They heard nothing of the bleat of the firing guns. Even the bursting of shrapnel went unheeded, save at a time when a sh.e.l.l exploded close by, and was faintly heard.
Tom was wisely taking but little chance. He maintained an alt.i.tude that prevented most of the shrapnel from coming anywhere near the plane.
They crossed the enemy front, and sped on. The bombardment diminished in fury as they left the first and second line trenches behind them. It was continued to some extent from an elevation further back, but as Tom knew of this formation, and had crept up still higher, no accident happened to them.
At last the air service boys were fully launched on their night voyage through the upper currents. Tom waited until he considered that it was really safe to change their course. He did not want to betray his movements in case some daring Boche pilot started up in a swift Fokker machine to pursue them.