The air was filled with smoke and dust from the crumbling plaster.

"Keep it up!" shouted Armande.

The bullets were spraying all around the edge of the hole which grew rapidly larger. Several of the men opened fire with their rifles. The machine-gun then ceased firing.

"You can see where the beams run now," said Jacques to the gunner. "Loosen them up a little."

Once more the withering fire was continued and soon a yawning hole appeared above the heads of the Frenchmen. A table came crashing through; a chair followed close behind and a huge lamp next spun through the air and smashed into a thousand pieces on the floor below.

It must not be supposed, however, that the Germans in the tower were idle all this time. Bullets went through the opening in both directions and already two of the Frenchmen had been killed; two more were wounded. The fight was desperate.

All at once a hand-grenade, dropped from above, landed squarely in front of the spot where Jacques was stationed. It was not four feet distant from the young Frenchman. Almost without thinking he acted. Springing forward he seized the deadly missile and hurled it at the ever-spreading opening in the ceiling. He had not been a second too soon. Just as the grenade was passing through the hole it exploded.

CHAPTER XVI

THE DUG-OUT

Jacques immediately sprang back to his former position in the alcove beside the machine-gun. Lucky it was for him that he did so. The hand-grenade exploded and the ceiling which already was greatly weakened speedily collapsed.

Plaster, furniture, rafters and men poured down in a mass. The force of the explosion had literally torn the ceiling to pieces and, the supports gone, it collapsed at once.

"Anyone left up there?" shouted Armande.

"Not a soul," replied Jacques quickly. "Watch out below though."

Many of the Germans were buried deep under the mass of débris on the floor. Here and there an arm appeared and the French were busily engaged in extricating their enemies from the heap. Seven men were taken out alive, suffering only from bruises; four more were captured badly wounded and six were found dead.

"Well I guess the fight's over," sighed Armande when the Germans had been deprived of their weapons and the pile had been thoroughly searched for any more bodies.

"Seems to be," agreed Jacques. "How about these men?" he asked, as he spoke, indicating the prisoners that had been taken.

"We'll take them back to our trenches of course," said Armande.

A few moments later the little band had left the ruined château and were on their way back to their lines. The struggle was still continuing violently and both sides were fighting desperately for possession of the disputed positions.

Arriving in the trenches Armande, Jacques, Lippen and the others soon found their regiment and having turned over their prisoners were quickly in the fighting again. Leon, Earl and Dubois were posted side by side and Armande and Jacques joined them at once.

"We thought you were dead, Jacques," cried Leon, delighted to see his comrade once more. "Where did you come from?"

The story was quickly told and just as it was completed the officer who had directed Jacques to set off the mine-field approached the place in which the boys were standing.

"Young man!" he exclaimed heartily, catching sight of Jacques, "you did splendid work. You saved our lines and made possible this counter-attack. You disappeared though and I feared you had been lost."

"I saw our men coming forward and I could not resist the temptation to join them, sir," said Jacques modestly.

"Well, I'm glad to see you again," said the officer. "We need men like you."

"They're all as good if not better," exclaimed Jacques earnestly.

"That's right too," agreed the officer. "Every Frenchman is a hero in these days of trouble."

He passed on and Jacques turned again to his comrades.

"Tell me," he exclaimed, "what has happened here?"

"Everything," said Earl grimly. "They certainly did pepper us and it was only a few minutes before you came back that they let up at all."

"They're still fairly busy I should say," remarked Jacques.

The shells were bursting all around in endless succession but fortunately the fire of the German batteries was directed mostly upon the positions to the right and left of those occupied by the douzième.

"They'll hit us before long," remarked Dubois.

"What do you mean?" asked Earl. "A counter-attack?"

"I think so. They may not try it to-day but they surely will some time to-night; the Boches are getting so they like to fight in the dark now."

"Perhaps it's because they can't see the bayonets so well," laughed Armande. "They don't care much about cold steel, do they?"

"I should say not," agreed Dubois. "It's funny too for they are certainly brave enough when it comes to facing shells and machine-guns."

"Hand-to-hand work isn't suited to Germans, I guess," said Leon. "You never heard of a German being a good boxer either; they don't seem to be much good at things that need quick thinking and action."

"Germans are good athletes though," exclaimed Earl.

"In certain sports they are," Leon agreed. "They're good wrestlers and gymnasts and that sort of thing. I say that they're strong but they're not athletic. The strongest fellows aren't always the best athletes, you know."

Meanwhile the guns boomed constantly. The shells from the French guns were exploding far in advance of the positions the douzième now occupied.

"They're probably shelling the ground where the Germans are trying to dig new trenches," said Dubois.

"I hope they hit 'em," exclaimed Leon fervently.

There were many dug-outs along the line of the trench. Some of them were shell-proof and were fifteen to twenty feet below the surface of the ground; the entrance to these was through a door, level with the floor of the trench. A stairway, just wide enough to permit one man to pass, led down to them. The roofs were reinforced with huge timbers and so strongly were they constructed that most of them were intact, despite the heavy bombardment to which they had been subjected.

"Have you seen these dug-outs?" Leon inquired of Jacques.

"No, I haven't."

"Come along then and I'll show them to you," exclaimed Leon. "Some of them are regular palaces."

"I doubt that," laughed Jacques as the two boys set out together.

They inspected a dug-out similar to the one described above. Then they discovered others, larger but only slightly lower than the trenches.

"Look at them," exclaimed Leon. "They must have used these for living quarters when things were quiet."

"I guess they did," agreed Jacques. "If they're all like this they're pretty good size too; this one must be six feet wide and nearly thirty feet long."

"See those logs on the ceiling; they're a foot in diameter at least."

"Yes, but they're not shell-proof. They have to be deeper in the ground than this to be safe from high explosive shells."

The two young soldiers continued along the trench. Many of the dug-outs, similar to that they had just left, were in ruins. Jacques was correct when he said they were not proof against the big shells. Most of them were destroyed, the logs splintered to kindling-wood and strewn far and wide over the ground.

"Where does this lead, do you suppose?" demanded Leon suddenly.

"Let's follow it and see," exclaimed Jacques readily.

A blind alley ran off from the main trench and it was this that the two boys were following. There was a narrow doorway at the end of the alley and through this they advanced.

"Another dug-out, I suppose," said Jacques.

"Looks like a real one," exclaimed Leon. "Whew!" he whistled in amazement as he descended the stairs and stepped out into the underground room.

"Say," said Jacques warmly, "some general must have lived here."

"I should think as much," agreed Leon. "Just look around you; rugs on the floor, pictures and mirrors on the wall."

"And a wonderful stove; let's make some tea," cried Jacques eagerly.

"Where's the tea?"

"There must be some here; there seems to be everything else."

A short search soon produced tea and crackers; a fire was started in the stove and water was put on to boil. Tea was always in demand by the soldiers; it was their favorite beverage in the trenches.

"Isn't this great?" exclaimed Leon. "War wouldn't be so bad if we only had places like this to live in."

"Did you notice that there were two entrances?" asked Jacques.

"Yes, one at each end. I suppose that's in case the trench should cave in and block up one passage-way you could still get out the other side."

"Pull up a chair, Leon," exclaimed Jacques. "We might as well be comfortable as long as we can."

The two soldiers sat by the fire and sipped their tea and chatted. Now and again a dull roar told them that the Germans were still busy and that they still had their opponents, the French, in mind.

"Do you suppose we could be hurt down here?" remarked Leon.

"If one of those big German shells happened to strike squarely over us I guess we'd be hurt all right," said Jacques.

"It would have to be a direct hit though."

"That's true and I don't believe there is much chance of its happening. This seems to me about the safest spot I've seen."

"Too bad the others don't know about it," said Leon.

"Listen," warned Jacques. "Here comes somebody now."

A moment later six soldiers filed into the dug-out. They were men from the douzième, but belonged to a different company from that of which Leon and Jacques were members.

"Come in," cried Jacques cordially. "Have some tea."

No second invitation was needed and the eight soldiers were soon grouped around the fire, sipping canteens of hot tea. Everyone was as enthusiastic as Leon and Jacques had been and life seemed worth while once more. The time was short, however; it soon became necessary for our two young friends to leave and go back to their post.

They said good-by to their comrades and made their way outside. Coming to the little alley that led to the dug-out they stopped and listened to the artillery duel.

"The Germans are tuning up again," remarked Jacques.

"They certainly are," agreed Leon. "Did you ever notice how you can tell from the sound a shell makes going through the air just what kind it is?"

"Yes, and you can judge their direction and where they're going to fall too."

Suddenly Jacques grasped Leon fiercely by the arm. "Look out," he cried in terror, and threw himself and his companion prone upon the floor of the trench.

He had heard a sound which he knew meant danger and possibly death; the awful whistling roar of a high explosive.

CHAPTER XVII

LIPPEN BREAKS

A terrific explosion shook the earth. Dirt was mixed with logs and stones and showered everything nearby. The deadly lyddite blackened the faces of the two young soldiers and half blinded them. For some moments they were too stunned to move.

Finally they recovered somewhat from the shock and rose to their feet.

"Look at that dug-out, Jacques," exclaimed Leon. "It's blown to pieces."

"How about the men inside?" cried Jacques. "There are six of them."

As he finished speaking one of the trapped soldiers crawled out. He pulled himself along with one arm, for the other was terribly shattered; one of his legs hung only by a tendon and a few shreds of flesh.

"Quick, Leon!" cried Jacques. "Cut the cord from your bandolier; you tie up his arm and I'll attend to his leg. We must stop this flow of blood or he'll die."

The wounded soldier was a fine, healthy boy; a few minutes before he had been telling what he planned to do when he went home on a furlough. Now his face was white with agony; his voice grew weaker and weaker and he died while Jacques and Leon were working over him.

"This is awful," cried Leon fiercely.

"This is war," said Jacques.

High explosive shells were now bursting all along the line; tons of earth were thrown high into the air and the very ground rocked beneath their feet. Men hurried from one spot to another trying to find protection where there was none; oftentimes masses of earth were blown in on top of them.

"Picks and shovels!" came the cry, and "Stretcher bearers! Stretcher bearers!" resounded on all sides.

"The rest of those men in the dug-out are dead, Leon," said Jacques calmly. "We can do nothing for them and the thing for us to do is to rejoin our company."

"Think of it," exclaimed Leon as they hurried along. "If we'd stayed in that dug-out two minutes longer we'd been dead now."

"Death comes quickly in war," remarked Jacques. "It hangs by a thread and you never can tell when it is going to strike you."

They soon reached the spot where their company was located and along with the rest of those who were off duty were immediately ordered into the deepest of the shell-proof dug-outs, where they were really quite safe.

"We're in for it, I guess," remarked Dubois laconically, as Jacques and Leon entered the dug-out. Earl and Armande were also there.

"Sure we are," exclaimed the latter brightly. "What of it?"

"There'll be a lot of our men killed."

"Not half as many as there will be Boches," said Armande. "Just wait until they send their infantry out; our machine-guns will make them wish they were back in their trenches."

"You're an optimist, Armande," said Earl. "Just listen to those shells up there."

"The Boches will come out about dark," said Armande. "We might just as well sleep until then."

"Not with that going on," exclaimed Leon. "At least not for me."

An hour later they were all ordered out. Every man had on a mask to guard against the poisonous gas that the Germans used so frequently just before they launched their attacks. Oftentimes too they would shower the opposing trenches with shells, causing irritation and smarting of the eyes so that the men could not see to shoot. Now and again they used liquid fire which shot out half a hundred feet from especially made machines somewhat resembling the nozzle of a hose.

The surprising thing is that the French could withstand all those terrible engines of destruction. Sheer courage had helped them the first time they were used and after that they were always provided with some good means of defense. The French are remarkably quick to learn.

It was dark as the men came up out of the dug-out. They had scarcely taken their places when there was a sudden hurricane of rifle and machine-gun fire. Almost instantly the whole battered landscape became lighted up under the flare of innumerable trench-rockets. Far ahead, the enemy, in irregular lines, could be seen advancing to the attack.

"Here they come," cried Armande. "Let 'em have it!"

A pitiless infantry fire was turned upon the Germans. An almost solid sheet of flame issuing from the French rifles marked the curve of their trenches. Almost at once the French artillery caught the range of the advancing troops; the air was filled with the roar of the bursting shells and the sad-sounding whing-g-g of flying shrapnel.

"No one can possibly come across that space alive," cried Leon incredulously.

"Yes, they can too," exclaimed Armande and a moment later the sharp staccato of a hand-grenade bursting nearby warned them that some of the enemy at least were already within striking distance.

The men worked feverishly. Rifles became hot they were fired so fast and so constantly. Hand-grenades were popping all around now and the noise became deafening. Like gray ghosts the Germans appeared under the flare of the guns and the weird light of the trench-rockets.

The French machine-guns mowed the Germans down like grass and the fact that they still came on was a high tribute to their bravery. Gradually the firing died down and the noise lessened. Broken and beaten back the Germans turned and fled. A cheer went up from the French line, while a farewell volley was poured into the mass of retreating Germans.

"What did I tell you?" demanded Armande triumphantly. "I knew they couldn't touch us and I'd just like to see them try it again."

"It cost us something," said Earl.

"Yes, but not one-quarter of what it did them."

"I hope not," agreed Earl. "It always costs the attacker more."

The strain of the fight let down and a reaction set in. The ground was strewn with the dead and dying and the moans of the wounded were anything but pleasant to hear. During the fight every man nerves himself to face whatever comes; afterwards there is sometimes a complete swing to the other extreme.

Arms and legs stuck out from heaps of earth. Dead men lay all around; blood was on everything. Nauseating odors filled the air. Suddenly from a spot directly behind Earl came a sound that made his blood run cold.

Lippen, the soldier who had fought so valiantly in the château, suddenly sprang to his feet. He uttered a wild, hideous, hysterical laugh and seizing an arm that protruded from the trench in front of him he hurled it far out over the battlefield.

He shrieked raucously and then suddenly sat down and began to sob. His companions gazed at him a moment in surprise and then in pity.

"What is it, Jacques?" demanded Earl. "What ails him?"

"He's crazy," said Jacques quietly.

"What do you mean?"

"He's gone insane; his nerves are shattered."

Lippen sat and sobbed; now and again he raised his head and gazed about him and the look in his eyes showed that all his reason had departed.

"How awful!" exclaimed Earl with a shudder. "Do you suppose he'll ever get well again?"

"It's hard to say," replied Jacques. "Sometimes they do and sometimes they don't."

"I've heard about these things happening in the trenches," remarked Leon. "This is the first case I've seen."

"There are a good many made the same way," said Jacques soberly. "The terrible strain and the awful slaughter affect men's nerves so that they sometimes go entirely to pieces. It is very sad."

"It's horrible!" muttered Earl with a shudder.

"For my part I'd rather be killed," said Leon.

Attendants came and led poor Lippen away. Perhaps with constant care and prolonged quiet his shattered nerves might mend. At any rate he was but one small part of the army and the war must go on whether he was gone or not. Of course all would be done for him that was possible, but after all one man more or less is a very tiny part of a big army. If sympathy was expended on every pitiful case there would not be much time left for fighting.

As the soldiers crouched behind the parapet Captain Le Blanc approached the spot where Jacques was seated.

"Private Dineau," he said, "I understand that you are an aviator."

"Yes, sir," exclaimed Jacques, quickly springing to his feet and saluting.

"You were once attached to the flying corps?"

"Yes, sir."

"You think you can still drive an aeroplane?"

"I am sure of it, sir."

"Very good," said the captain. "Come with me."

CHAPTER XVIII

AN ASSIGNMENT

"Well what do you suppose he's going to do?" exclaimed Earl after Jacques and Captain Le Blanc had disappeared.

"He's going flying, I suppose," said Dubois.

"Say," cried Earl enviously, "I wish we were."

"That's the best part of the service all right," said Leon. "Jacques and I were in it together once and I know what I'm talking about."

"Why did you ever leave it?" inquired Dubois.

"I don't know," said Leon. "We thought it would be more exciting with the infantry and so we got transferred."

"Flying's not as safe as it was at the beginning of the war," remarked Dubois.

"I know it isn't," said Leon. "There are ten times as many machines now as there were then and ten times as many flyers. Then again, scouting over trenches is much more dangerous than over the open country. Here you are fired at constantly by the anti-aircraft guns and you meet so many more machines; they're all concentrated in one spot."

"Just the same I'd like to try it," exclaimed Earl eagerly. "Do you suppose that if Jacques is given a machine he could take us along as observers?"

"No such luck I'm afraid," laughed Leon grimly. "We may never see him again."

"Let's hope it will not be as bad as that," said Dubois. "Jacques is certainly a fine boy."

"He's a good friend of mine all right," said Leon warmly.

After a time the two brothers and Dubois were relieved from duty and retired to their dug-out for rest and recuperation. They were soon asleep, for the experiences of the past few hours had been exhausting. Heavy and regular breathing soon testified that the other occupants of the underground room were also deep in slumber.

Leon suddenly opened his eyes with the vague impression in his mind that someone was shaking him. He awoke to find himself staring into the flare of a flashlight. Some soldier held it in one hand while with the other he tugged at Leon's sleeve.

The young soldier was awake instantly and on his feet. Men who live in constant danger do not waste any time waking up.

"What is it?" he demanded.

"Come with me," said the man whom Leon recognized as Captain Le Blanc's orderly. "Also bring your brother."

"Wake up, Earl," whispered Leon eagerly in his brother's ear.

A moment later the twins and their guide were making their way along the trenches towards the captain's quarters. It was very dark and difficult to see. Vague, shadowy forms crouching low behind the parapets, however, testified that France's children were still guarding her. Day after day and night after night the constant vigil was kept up; never for one moment did these human machines relax their caution. Everywhere throughout the length of the long battle-line, sharp eyes kept watch.

Winding through the numerous trenches the three soldiers finally came to their destination. A moment's delay and they were ushered into the dug-out which served as Captain Le Blanc's quarters. A short time before, this same shelter had served a corresponding purpose for some German official.

Seated at a table were three men. One of them the brothers immediately recognized as Captain Le Blanc but the other two were strangers. The officer on the captain's right turned to him.

"Are these the two young men of whom you spoke?" he inquired.

Captain Le Blanc turned and glanced questioningly at Jacques who stood nearby. The young Frenchman nodded his head slightly.

"These are the ones, General," said the captain, facing again the man who had questioned him.

"Very good," exclaimed the general, a keen-eyed soldier with white hair and a white mustache. "They are friends of yours I take it?" he remarked to Jacques.

"Yes, sir," replied Jacques with a prompt salute.

"Young men," said the general now addressing Leon and Earl, "I have a mission to be performed; it requires the services of an experienced aviator and we have decided that it is best for him to be accompanied by two men. It is dangerous but it is necessary. We have chosen you three young men from among many and we rely on you to carry the enterprise through to a successful conclusion.

"You will start at dawn; Private Dineau will be the aviator and he will have as aides the brothers Platt. You will be conducted to the machine you are to use and as dawn is not far distant I advise you to prepare yourselves at once. Good luck to you."

He turned away and the three boys, realizing that they were dismissed, immediately withdrew. Captain Le Blanc's orderly followed them.

"I will conduct you to your machine," he announced and set out at once, closely followed by the three young soldiers. Back from the front they walked, proceeding through the winding maze of communicating trenches. Few words were spoken until they emerged from the trenches entirely and came to the open road.

A small motor-car with a chauffeur seated at the wheel stood near the entrance to the trench.

"For us," announced the orderly and straightway climbed aboard.

His companions were not slow to follow his example and a moment later they were whizzing at breakneck speed along the highway.

"Where are we being sent?" demanded Earl, who all this time had been consumed with intense curiosity.

Jacques merely shrugged his shoulders. "I do not know," he said.

"Say," exclaimed Leon suddenly, "what's this driver trying to do; kill us? Personally I'd rather be killed in battle if I must die. An automobile accident seems out of place in war."

"He's going some all right, isn't he?" cried Earl. "I'd like it th——"

His words were suddenly cut short. The driver swung the car sharply to the right to avoid a huge shell-hole blown in the middle of the highway; he did not slacken his speed one bit, however. Earl was thrown off the seat violently and found himself on the floor of the car; Jacques landed there beside him at the same time.

"This is pretty bad," exclaimed Earl. "I agree with you, Leon; he ought to stop it."

"But he won't," announced Jacques. "They all go like this."

"Well, I'll certainly be glad when it's over," said Earl grimly. "I can't get up onto the seat again."

"Don't try," advised Jacques. "We'll soon be there."

"If we're not all dead," murmured Earl.

Presently, however, the speed slackened and the machine came to a stop. An aviation field with hangars all around appeared some half mile distant.

"Here we are," announced the orderly, stepping from the car.

"How fast were we going there, Leon?" inquired Earl as they hastened to follow their guide.

"Seventy miles an hour," said Leon. "Did you like it?"

"I did not," said Earl warmly. "That's too fast for me."

"Wait until we get into our aeroplane," warned Jacques. "We'll travel a hundred miles an hour easily."

"There are no shell-holes in the air anyway," said Earl. "We can't be wrecked that way as we nearly were back there on the road."

"Don't you believe it," exclaimed Jacques. "When they begin firing at us from the German trenches you'll find there are plenty of shell-holes in the air all right."

"By the way, haven't you any idea where we're going?"

"None at all. All I know is that this orderly is instructed to take us somewhere over here where we'll get our orders."

"Who was that man who talked to us?" asked Leon. "They called him 'general.'"

"That was General Petain," said Jacques. "Didn't you know him?"

"I never saw him before. Was that really he?"

General Petain was the man made famous by his splendid defense of Verdun and he was a popular hero with the soldiers.

"Who was the third man?" asked Earl.

"I don't know who he was."

The first faint streaks of dawn were just beginning to color the eastern sky as the little party stopped in front of a vine-covered cottage, just to one side of the aviation field.

"Here I leave you," announced their guide. "You are to report to Major Villier." He immediately turned on his heel and walked away.

Jacques led the way inside. The young soldiers were evidently expected for they were led without delay into the presence of an officer seated under a lamp, intently studying a map. He looked up as the three boys entered the room.

"Which one of you is Private Dineau?" he inquired.

"I am," announced Jacques stepping forward.

"Good," exclaimed the major. "Here are dispatches which you are to deliver to Colonel Erhard. He is in command at the village of Flambeau in the Vosges Mountains. The dispatches are important and should reach him at the earliest possible moment." As he spoke he handed a small packet to Jacques.

"Your aeroplane is waiting for you," he continued. "It will contain everything you will have need of and I wish you a good trip and a safe return, I would suggest that your two aides who look so very much alike go and see that everything is in readiness. Meanwhile I will point out Flambeau to you on the map and the best route for you to follow."

The major smiled at the two brothers who immediately departed, and guided by a soldier hastened across the aviation field to the spot where a big armored monoplane was just being trundled out of its hangar. A machine-gun was mounted on board and several bombs were also to be carried.

"Here are coats for you," said one of the men as the two brothers approached the machine. "You will find it cold up among the clouds today."

"How about food?" inquired Earl. He was always particular about that.

"Two days' rations for three men," said the soldier. "That is more than you'll need if all goes well but it's a good plan to be prepared."

"I think so too," agreed Earl. "What horsepower is this machine?"

"One hundred."

"Whew!" whistled Earl. "She ought to be able to make time."

"She can," said the soldier confidently. "Just wait until young Dineau gets hold of her. He'll make her sail; he's a wonder, that boy. It's a shame he ever got out of the aviation corps."

"He was good all right, wasn't he?" demanded Leon.

"Good?" exclaimed the man. "I should say he was good. Why I'll bet that if he had stuck to the flying corps he'd have bagged a dozen Boche machines by this time."

"He's reckless though," said Leon.

"Not reckless, but daring," insisted the soldier. "He doesn't know fear."

"Here he comes now," observed Earl.

CHAPTER XIX

OVER THE TRENCHES

A few moments later Jacques was in the driver's seat and Leon and Earl had taken their places on board. Every boy was dressed in a heavy coat and an aviator's hood, with protection for the ears and face; warm gloves were on their hands, for it promised to be biting cold in the high air that day.

The top rim of the sun was just appearing over the edge of the trees as Jacques pressed the button which set the self-starter whirring. The engine roared and the pilot listened intently for any sound of defect to come to his well-trained ear. An aviator must know by the sound just what is wrong with his motor; there is no chance to search for the cause of the trouble when you are a mile or two above ground.

Apparently Jacques was satisfied for he throttled the motor down until it merely purred. "All ready?" he demanded.

"Got your dispatches, have you?" asked Leon.

"Yes," said Jacques, feeling of his breast pocket.

"I guess we're off then," cried Leon eagerly. "Let 'er go."

The monoplane began to move forward slowly. The little knot of men gathered around called good-bys as the great mechanical bird ran out across the field. Faster and faster it went; finally Jacques pulled a lever and gracefully and easily it rose from the ground. Up, up, up it soared, swiftly and steadily.

"Say," almost shouted Earl, "this is wonderful. I've never been in an aeroplane before, you know."

"Well you keep your eye out for other machines and for people shooting at us from below," advised Leon. "That's your job and mine."

"It's such a wonderful sensation flying like this," cried Earl. "Just look down below us there. The roads look like white ribbons and the trees like bouquets. Don't the houses seem small?"

Earl was enchanted. Leon and Jacques too, although they were experienced hands at this game, once more felt the thrill of soaring swiftly through space. Jacques particularly was pleased to be in the driver's seat of an aeroplane again; his face plainly showed his keen enjoyment.

Higher and higher they mounted; below them the earth seemed miles away and the buildings and fields appeared to be of toy size. It was cold, however, bitterly cold, and all three of the boys were profoundly thankful for their warm wraps.

"You know it feels as if we were standing still," exclaimed Earl.

"I know it," agreed his brother. "The higher you go the more it seems that way too."

"Yes, sir," cried Earl, "if I didn't know better I should say that we were absolutely stationary and that it was the earth below that moved."

"Isn't the machine steady?"

"Feels as steady as a rock. You know I haven't felt the least bit nervous since we started."

"Why should you?" demanded Leon. "We're a good deal safer here than we are in the trenches."

"I suppose that's true," mused Earl. "You wouldn't think so, though, would you?"

"I don't know. The way the machines are perfected nowadays there is practically no danger from accident and with a good aviator you are as safe as any one can be in war. Of course plenty of machines are destroyed and the pilots and observers killed, but I believe the proportion is smaller than in any other branch of the service."

"Say," called Jacques from the pilot's seat.

"What is it?" demanded Leon.

"I've got a question to ask you. There are two ways of reaching Flambeau and I want your advice as to which to take. One way we can go around back of the firing line and be practically safe all the way."

"Go that way then," exclaimed Leon quickly.

"But," objected Jacques, "that course is much longer."

"Major Villier and General Petain both said that the dispatches should be delivered as soon as possible, didn't they?"

"'At the earliest possible moment,' was the way they expressed it," said Jacques.

"Then," said Leon, "we ought to take the shortest route."

"It crosses the battle line twice," said Jacques. "You know the trenches make a big loop below here and we will have to cut straight across that loop."

"Never mind," exclaimed Leon. "If they said to deliver the dispatches at the earliest possible moment it's for us to take the shortest possible course in order to do that."

"I think so too," agreed Earl. "We'll have to run our chances, that's all."

"There are the trenches below us now," cried Leon suddenly. "See them up ahead there?"

"Sure enough," exclaimed Earl. "Don't they look funny from here? They look just like a series of deep scars running in all directions."

"You can't see the first line trenches yet," said Leon. "You can easily tell them for they'll run exactly parallel to one another and the space in between them will be the only place where you see no trenches. Behind both the French and German first lines there are any number of other trenches running in all directions and all connected. But in between the two front ones there is nothing; 'no-man's land' they call it."

"'Dead-man's land' would be better I should think."

"See them firing," exclaimed Leon suddenly.

"At us?" queried Earl.

"No. You can see those puffs of smoke down below there though; those are bursting shells."

"There are the first line trenches too," said Earl abruptly. "You can tell them easily, can't you, just as you said."

"How high are we, Jacques?" inquired Leon.

The young aviator consulted his indicator. "Two thousand meters," he replied.

"Let's see," said Leon, trying to figure it out in his head, "there are a little over three feet in a meter and that would make two thousand meters about six thousand feet or over. There are five thousand two hundred and forty feet in a mile; that makes us a little over a mile high."

"Can they hit us at this distance?" asked Earl.

"They can, but I hope they don't," said Leon grimly.

"Funny we haven't seen any other machines," remarked Earl.

"Well we're right over the front trenches now and I guess plenty of people see us and are looking at us right this minute."

As he spoke a puff of white smoke suddenly appeared ahead of them but some distance below.

"They're firing at us," exclaimed Jacques.

"Shall we drop a bomb on them?" cried Earl eagerly. "We want them to know that we're alive, you know."

"Don't do it," cautioned Jacques. "It would probably be wasted here."

"There's another shot," cried Leon. "Behind us this time."

"Let's hope their aim continues as poor as that," said Jacques. "We want to get those dispatches to Colonel Erhard at Flambeau before anything happens to us."

"We'll be over hostile territory all the way, won't we?" asked Earl.

"We will," replied Jacques, "and we'll be fired at all the way too. If they should send a couple of machines up after us we might have to run for it."

"I don't know where we'd run to," said Leon grimly.

"Nor I," admitted Jacques. "Let's hope that we can out-distance any machines that start to chase us."

"Do you think this machine is faster than the German ones?" asked Earl.

"Faster than most of them," replied Jacques. "Probably not as speedy as those new fokkers though; they go like the wind, but they are too light and I doubt if one of them could do us a great deal of harm."

They passed over many towns and hamlets; the green fields of France lay spread out beneath them like some soft green carpet. It all appeared very beautiful and peaceful now that they were some miles back of the firing line. An occasional puff of smoke around them, however, showed that they still traversed hostile territory; at least it was land held by the invader.

Once a German machine rose from its hangar far below and set out in pursuit of the speeding monoplane; it was quickly out-distanced, however, and soon abandoned the chase. Without any special incident the three young friends progressed until far ahead of them they could make out the faint outlines of the Vosges.

"There are the mountains," cried Jacques.

"Sure enough," exclaimed Earl. "Well we've had a pretty easy trip of it, haven't we? It has been a regular pleasure jaunt."

"We're not there yet," warned Leon.

CHAPTER XX

AT FLAMBEAU

Closer and closer they came to the mountains. Presently it was possible to make out the different summits, all of them wrapped in a blue haze.

"Do you know where Flambeau is, Jacques?" queried Earl.

"I do."

"We'll have to cross the firing line again, won't we?"

"Yes; pretty soon now too, I think."

"Do you know where it runs here?" asked Leon. "If it should follow the top of some of these mountains we'd have to ascend much higher than we are now to be out of range, wouldn't we?"

"We certainly would. Keep your eyes open and see if you can see any signs of trenches; we ought to be pretty close now."

The foothills were below them now. The wooded slopes were cut and gashed by gullies and ravines and now and then a fertile valley appeared. The hills grew in size rapidly, however, and it was not long before the mountains themselves were underneath them. Once or twice a cloud wrapped them in its damp folds and it was with a feeling of relief when they emerged into the sunlight again.

"Whew, it's cold," exclaimed Leon slapping his hands together.

"My hands are cold too," said Jacques. "You have the best of me though for I can't warm them the way you are doing."

"Please don't try," laughed Earl. "I'd rather that you should have cold hands than we should all go spinning down to earth."

"Well I'll—" Jacques began when Leon suddenly interrupted him.

"There are the trenches," he exclaimed. "See them? They run right across that valley."

"That's right," agreed Jacques. "Let's see; we must be fairly close to our destination by now." He consulted his map.

"I hope so," exclaimed Earl. "I'm cold and hungry."

"Right over that next summit," said Jacques. "If our luck only holds out a few minutes longer we're all right."

They crossed the firing line which appeared very far away in the distant valley. They passed over the summit of the mountain Jacques had indicated and far below them they saw a tiny hamlet; a white church with its pointed steeple stood in the center of the little cluster of houses.

"There's Flambeau," announced Jacques.

"Good," cried Earl. "Where do we land? In that big field behind the church?"

"That seems to be the only place, doesn't it?"

"As far as I can see it is," remarked Leon.

"All right," said Jacques. "Here we go."

The monoplane dipped and began to descend in great circles. The young pilot shut off the motor and in silence, except for the noise of the air rushing through the wings, it swooped downward.

Earl did not enjoy this as much as he had the previous flying. As they came nearer and nearer to earth he could see the trees and fields rushing past beneath them and the sensation of speed was very great. He felt slightly nauseated and clung tightly to the sides of his seat.

Jacques was most skillful, however. He maneuvered the monoplane until they were directly over the field where they intended to make a landing. Then he suddenly shot downward until they were but a few yards above the ground; suddenly he straightened out the machine and they came to earth gracefully and without a jar. The monoplane ran along the ground for a short distance and came to a stop.

A squad of soldiers in the blue uniform of France came hurrying forward to greet the aviators.

"Is this Flambeau?" demanded Jacques of the corporal.

"It is," replied the man addressed.

"And Colonel Erhard is here?"

"He is. Do you wish to see him?"

"I have some most important dispatches for him."

"Of course you wish to deliver them to him in person?"

"Yes," said Jacques.

"If you will come with me," said the corporal, "I will conduct you to him at once."

Jacques climbed out of the monoplane and set out across the field with the corporal.

"We'll wait right here for you, Jacques," called Leon, as he and Earl also stepped out of the machine and began to stretch their legs.

"Anglais?" queried one of the soldiers, hearing Leon speak in English.

"Américain," smiled Leon.

"Bon," exclaimed the man. "Parlez-vous Francais? Je ne parle pas l'Anglaise." (Good. Do you speak French? I do not speak English.)

"Un peu" (a little), said Leon and he and his brother did their best to carry on a conversation in French with their new friends.

It seemed that there had been spirited fighting for the last week along that portion of the front. The men were of the opinion that the attacks and counter-attacks thus far had been in the nature of feelers and that both sides were searching for a weak spot in their opponent's line. They all seemed to feel that a general offensive was about to be undertaken and every man was convinced that the dispatches the three young friends had brought were in some way connected with this movement.

The sun was warm in the field and the twin brothers spent a most enjoyable hour talking with their new comrades. Like all the French troops they were talkative, enthusiastic and hospitable. They were eager for news; they were certain that France and her allies would be victorious; they also brought hot coffee and sweet chocolate for the young Americans. They were delighted to think that people from a land so distant should think enough of France to fight for her in her struggle for freedom and justice.

Leon and Earl were particularly interested to learn that large forces of Russian troops were now fighting side by side with their allies on the western front. They had not heard that there were Russian soldiers in France, although such reports had often been freely circulated. A soldier knows little about the war in which he fights; he sees what takes place on the ground in the immediate vicinity of the place where he is located but the general outcome or fortunes of battles he knows nothing about. People at home or in neutral countries know much more about the actual trend of the war than does the soldier who fights its battles.

Finally Jacques went back to the monoplane and preparations for an immediate return were made.

"All ready to go back?" he inquired cheerily.

"Yes," said Leon. "Did you deliver your dispatches all right?"

"Yes, indeed, and now we have nothing to think about except getting back home to the douzième once more."

"I'd hardly call it home," laughed Earl. "I hope there aren't as many bullets and shells flying around our homes as there are around the douzième. Home wouldn't be very comfortable under those circumstances."

"Well we'd better start anyway," said Jacques. "All aboard!"

The boys quickly scrambled back to their places. The little group of soldiers they were leaving wished them the best of luck and then the machine started.

"Do you suppose we'll have as easy a trip home as we did coming?" asked Earl as they began to soar higher and higher.

"We can go the long way if you want to," said Jacques.

"What do you think, Leon?" demanded Earl. "Don't you think we might as well take the longer but the safer route on the return trip?"

"I don't see why not," exclaimed Leon. "We can fly just behind the battle-line all the way back. I'd like to see what it looks like."

"So should I," agreed Jacques. "We'll do it then, only we'll have to keep a mile or so behind the front."

"That's all right," exclaimed Earl. "We can see if we're a mile or so high."

They had covered scarcely two miles from the village of Flambeau when Leon suddenly spied another aeroplane.

"Look!" he cried excitedly. "There's another monoplane!"

"Where?" demanded Jacques.

"To your right."

One glance was enough for Jacques. His experienced eye immediately identified the stranger and he turned to his two aides.

"That's a German flier," he remarked. "Get the machine-gun ready."

"What are you going to do?" demanded Earl eagerly.

"Chase him of course," said Jacques.

CHAPTER XXI

DISABLED

"Now you fellows will have to do all the work with the machine-gun," exclaimed Jacques as he shifted the course of the big monoplane and started in pursuit of their enemy.

"Leave that to us," cried Leon.

"I'll have to; maneuvering this machine will keep me busy."

Higher and higher Jacques steered the monoplane. His desire was to rise above their opponent if possible and thus take him at a disadvantage.

"Do you suppose he sees us?" demanded Earl.

"Certainly he does," said Leon.

"And he's ready to fight?"

"If he wasn't he'd turn and run."

"How soon shall we open fire?"

"I don't know yet; he's two miles away now, anyway."

Speeding through the sky the two great mechanical birds rushed at each other. With jaw set and a cool calculating eye Jacques sat in the pilot's seat and directed the course of his flier. Earl and Leon held the machine-gun ready for instant action.

"We're almost over the battle-line," announced Earl suddenly. "I can see the trenches below."

"Never mind them," exclaimed Leon. "Watch that machine."

"He's smaller than we are," said Earl.

"There are only two men in it too," added Leon.

"Get ready," ordered Jacques suddenly.

As the two machines approached each other Jacques all at once elevated his front plane and the big French flier rose swiftly higher and higher. The opponents were scarcely a half-mile apart now and as the monoplane in which the three young soldiers of France were seated rose above its adversary Leon and Earl opened fire with the machine-gun.

The Germans replied but the aim of each was poor and the two fliers swept past each other unharmed.

"Turn around, Jacques, and go back after him," cried Leon excitedly. "We'll get him next time."

With a wide graceful sweep Jacques turned the big monoplane and advanced again to the attack. The German also had wheeled and once again the two machines approached each other, maneuvering for position.

"Be careful now," warned Jacques. "We can't afford to miss many times for you may be sure he won't."

"Get above him, Jacques," cried Earl. "That's our best chance."

They were high above the summits of the Vosges now: the air was bitterly cold, but the three young aviators did not notice that fact. Neither did they notice that in their maneuvers they had crossed the battle line and were now flying over territory occupied by their foes. Their one object was the German aeroplane and everything else had been forgotten in their desire to accomplish its downfall.

Around and around the two machines flew, each one trying to force its opponent into a position of disadvantage.

"We're faster than he is, Jacques," cried Leon. "Follow him up from behind and go higher than he does."

"I don't believe we can do that," exclaimed Jacques doubtfully.

"Try it," urged Leon eagerly.

"I'll try it."

Jacques skillfully wheeled the machine and describing a great loop, doubled on his course. Meanwhile he rose to greater and greater heights. The earth was now many thousand feet below; even the clouds were beneath them in many instances.

"He's running away," cried Earl suddenly.

"After him, Jacques! After him!" shouted Leon.

The German, perceiving Jacques' purpose had turned and was now fleeing at full speed. No more did he circle and maneuver for position; his course was straightened out and he raced for safety.

"We'll get him," shouted Leon. "We're gaining fast."

Closer and closer they came to their enemy. Little by little the distance between the two racing machines decreased. The three boys leaned forward tensely as if to urge their flier on; Leon and Earl sat ready to open fire with the machine-gun the moment Jacques should give the word.

Suddenly the German machine shot downward; it was a ruse to throw off the pursuer who followed so relentlessly, but it was of no avail. Jacques did the same thing and earthward the big monoplane rushed at breakneck speed.

The German flier turned and started back; Jacques followed. All the time the three boys were gaining on their foe. They were almost within range now and the twin brothers prepared to carry out their part of the task in hand.

"Get ready," warned Jacques when they were only a few hundred yards behind their opponent and some distance above him.

"We're ready," answered Leon quickly.

"Let 'em have it then," cried Jacques.

The sharp rattling fire of the machine-gun answered his words and even the roar of the motor was unheard in the tumult. Below, the Germans could be seen aiming their quick-firers skyward at their French pursuer.

Jacques had been successful in gaining the better position, however, and they had their foe at a distinct disadvantage. Leon and Earl poured a deadly stream of bullets at their adversary. "He's hit," cried Earl suddenly.

"So are we," exclaimed Jacques.

"Where?" demanded Leon in alarm.

"A bullet has cut one of the supports for our wings."

"Is it dangerous?" asked Earl anxiously.

"I'm afraid so; I can't tell yet."

The fire from the German machine had ceased. It floated through the air as though the pilot had lost control and its speed had decreased greatly.

"Give him another volley, Leon," urged Jacques.

They were directly above their opponent now. Pointing the machine-gun straight downward the two brothers sent another hail of bullets whistling towards their foe.

The German machine fluttered for a moment like a wounded bird. Suddenly a blaze appeared from a spot near the gasoline tank; a moment later there was a burst of flame enveloping nearly the whole machine. It reeled drunkenly for a moment and then fell.

Fascinated, the two brothers watched its descent. Like some great flaming meteor it hurtled earthward. Down, down, down it plunged into the distant valley below. A sheet of fire trailed behind until finally it struck the earth with a crash; there was a burst of smoke and with a start the young Americans came to themselves again.

The horror and the awfulness of their opponent's death had had a profound effect upon them and for the moment they had forgotten everything else. Still, this was war and death is part of the game.

Jacques, however, had paid no attention to the fate of the German flier. All he knew was that his own machine was disabled and that he and his companions were in deadly peril.

"What do you think, Jacques?" demanded Leon. "Will that wing hold up?"

"I do not think so," replied Jacques soberly. "I think we must land."

"Where are we?"

"Inside the German lines."

"But if we land here we will all be taken prisoners."

"Our lines must be ten miles away," said Jacques. "What can we do?"

"It won't hold us that far you think?" asked Earl anxiously.

"I am sure it won't."

"Can't we try it?"

"It would be foolish," said Jacques firmly. "Unless we land at once that wing may collapse and then we shall go spinning towards the earth just as fast as did those Germans."

"You know best," exclaimed Leon. "I hate to think of being taken to some German prison camp though."

"Perhaps we can make repairs," said Jacques. Carefully he descended, now and then casting an anxious look towards the weakened support. Below was a heavily wooded valley with only an occasional small clearing where a tiny farm appeared.

"Can we land all right?" inquired Earl.

"We can with luck," replied Jacques grimly.

The big monoplane wobbled badly at times and the young aviator had to call upon all of his skill to prevent the machine from capsizing. As they neared the ground the three boys maintained a strict silence and with anxious hearts awaited the outcome.

A wide forest stretched beneath them. The waving tree-tops appeared soft and feathery from above, but the three boys knew that unless they could avoid the trees their doom was sealed. The open space in which Jacques was trying to effect a landing seemed pitifully small.

The young Frenchman was a past master of aviation, however. With the greatest skill he directed the disabled machine until they were directly above the clearing. He shut off the engine, which had been running at only half speed lately; one final short turn and he brought the aeroplane safely to earth.

The landing was in a plowed field and as a result not as smooth as it would have been on the aviation grounds, but they were safe; that was the principal thing.

"Good work, Jacques!" cried Leon enthusiastically.

"We're safe from the air but how about the Germans?" demanded Jacques anxiously.

"Well they won't take us without an argument anyway," exclaimed Leon. He drew his automatic revolver from its case and gazed apprehensively at the little white house which stood in one corner of the clearing.

"See if you can't repair that wing, Jacques," urged Earl. "We may be able to fix it and get back without any trouble at all."

"No Germans are apt to be around here anyway," exclaimed Leon. "Why we are miles and miles behind the front and in the middle of a big forest. We could hide in these woods for weeks and never be discovered."

"German observers have undoubtedly seen our machine descend," said Jacques. "They are probably searching for us already."

"Look there!" cried Earl suddenly.

CHAPTER XXII

IN THE CLEARING

High in the air above the spot where the three boys were standing appeared an aeroplane.

"A German machine," exclaimed Leon.

"And looking for us," added Jacques grimly.

"Do you suppose he sees us?" asked Earl.

"No doubt of it," said Jacques confidently. "There'll be German soldiers here before you know it."

"Can't you repair the machine?"

"I think I could if I had some wire."

"I'll run over to the house and see if I can't find some."

"There may be Germans living there," objected Jacques. "You'd better be careful."

"He dropped a bomb," suddenly cried Leon who had not once removed his gaze from the flier high above their heads.

A tiny speck appeared under the aeroplane and rapidly approached the earth.

"Lie down," shouted Jacques, immediately suiting his action to the word. The two brothers instantly did likewise.

A moment later there was a sharp explosion. From the sound it was certain that the bomb had struck only a short distance away. A moment after hearing the report, however, the three young soldiers were on their feet.

"Where did it land?" demanded Earl.

"On that barn," exclaimed Leon. "Just look at it."

The roof had been partly blown off the little barn and already the structure was in flames.

"I hope he doesn't try it again," said Earl gazing skyward.

"I guess he won't," said Jacques. "He seems to be flying away."

"Yes," exclaimed Leon. "I suppose he's gone to tell where we are and to send somebody after us."

"If I only had some wire," said Jacques examining the broken support.

"Well I'm going over to see if we can't find something in that house," said Earl firmly. "It's funny there doesn't seem to be anybody around."

"The house must be empty," said Leon. "That bomb and the fire would certainly have brought any one out if the place was occupied."

At that moment, however, the door of the house opened and two men in priest's robes appeared. They glanced once in the direction of the damaged monoplane and then rushed towards the burning barn.

"They can't do much to stop that fire now," remarked Leon grimly. "By the way the barn burns it must be full of hay."

"I'll go speak to them," exclaimed Earl. "They may be able to give us some wire."

"I'd better go, I guess," said Jacques. "As my French is better than yours I can probably talk to them easier than you can."

"That's true," agreed Earl readily. "Why don't we all go?"

"You two stay here and guard this monoplane," exclaimed Jacques. "They may arrive here after us at any minute." He set off at a run across the field.

"If that aviator who threw the bomb has landed yet," remarked Leon, "he has undoubtedly telephoned to the post nearest this place and soldiers are probably on their way here already."

"They've got to go through a lot of woods to reach this spot," said Earl. "Perhaps they won't be able to find it."

"Don't you worry about that; they'll come straight here without the least bit of trouble."

"The minute any Germans appear it seems to me the thing for us to do is to take to the woods. We might be able to escape that way."

"Our chance of escape depends on whether Jacques can get any wire or not," said Leon. "I wish he could hurry."

"He'll do his best," remarked Earl. "You may be sure of that."

"What's he doing over there anyway?"

"Talking with the priests as far as I can see," said Earl. "I guess they decided there was no use in trying to save their barn."

"I should say not. It's too bad though and as a matter of fact we are the ones who are really to blame for it."

"How so?"

"Well, if we hadn't landed in this clearing that German flier would not have dropped any bombs down here."

"That's true," agreed Earl. "Where's that priest going?"

He had turned and was walking swiftly towards the house. Jacques stood talking with the other priest for a moment and then he too started in the direction of the dwelling.

"Do you think those priests are French?" asked Earl.

"I don't know; I suppose so though."

"Well if they are they'll help us, won't they?"

"They'd probably like to but I don't know whether they'd dare or not."

"The Germans would do something to them if they were caught aiding us in any way I suppose."

"They certainly would," exclaimed Leon.

"Shoot them?"

"Probably."

Jacques and the priest were now inside the house and it seemed to the two brothers who waited so impatiently that they were gone a very long time. The remaining priest stood and sadly watched the eager flames destroy the barn as if it were made of paper.

At length, however, the door of the house opened once more and Jacques and the priest reappeared.

"What has Jacques under his arm?" demanded Earl.

"I can't see," said Leon.

"It's a roll of wire," cried Earl suddenly. "We'll soon be off now."

"If the Germans don't reach here first we will."

"Don't be so gloomy," Earl protested. "Of course we'll get away."

"It'll be dark soon."

"All the better. They won't be able to see us in the dark."

"And we won't be able to see our way."

"You're an old pessimist," exclaimed Earl lightly. "Good boy, Jacques," he cried as the young Frenchman came within hearing. "I knew you'd fix us up all right."

"We must hurry," panted Jacques, his breath almost gone after his quick trip across the field. "We haven't much time."

"Can't I help?" inquired Earl eagerly.

"No, thanks; I can probably work faster alone."

He set to work immediately and without wasting a moment or making a false move began the work of repairing the weakened support. Meanwhile Earl and Leon kept a sharp lookout on all sides for any sign of their enemies.

"Who were those priests?" asked Earl finally.

"Frenchmen," replied Jacques keeping right on with his work.

"How do they happen to be living here inside the German lines?"

"This place is a sort of monastery or home and they are allowed to stay here for some reason. Every day one or the other of them has to report at the nearest German post though; that is five miles away."

"How do they reach it?" inquired Leon.

"They have a bicycle they use in good weather and in bad they have to walk."

"Is there a good road through the forest?"

"Fairly so, they said."

"That's a pretty tough job, isn't it?" exclaimed Leon. "Still I suppose they'd rather do that than leave their home."

Jacques still toiled earnestly at his task. The sun was fading in the west and the shadows of the forest trees began to lengthen. It would be dark presently.

"How soon can we start?" asked Leon anxiously.

"I don't know," replied Jacques. "In about ten minutes, I hope."

"Well we've been lucky so far not to have been discovered," exclaimed Earl. "I hope our luck keeps up."

"We've been discovered all right," said Leon. "Don't worry about that; they haven't reached here yet, that's all."

"And we certainly hope they won't," muttered Jacques fervently.

With anxious eyes the two brothers scanned the forest edges all around the clearing. The barn still blazed brightly, though now but one wall remained standing; one by one the others had collapsed.

Five minutes more and they would be safe. Jacques was putting the finishing touches on his work and was almost ready to start. He was an excellent and speedy workman but the time spent seemed dreadfully long to his two companions. They stood first on one foot and then on the other. Would he never finish?

"All ready," cried Jacques at last.

"Can we get in?" demanded Earl eagerly.

"Certainly. Jump aboard and I'll join you in a second, just as soon as I get this wire out of our way."

The two brothers needed no second invitation and made haste to do as Jacques had directed them. Earl was just about to climb into his seat with Leon close behind him when there was a rifle shot and a bullet, whistling through the air, passed close above their heads.

CHAPTER XXIII

IN THE DARK

"Look out!" shouted Jacques. "Here come the Germans!"

"Jump in!" cried Leon. "We can get away before they reach us."

"No chance," said Jacques positively. "Get out of there as fast as you can."

More bullets followed the first, until the air seemed alive with them. A small detachment of German cavalry now appeared from the shelter of the forest and began to gallop swiftly across the field. As they approached they shouted and fired their revolvers rapidly.

"They think we'll surrender," exclaimed Leon. "We'll fool them."

He and Earl quickly scrambled out from the monoplane and in company with Jacques rushed around behind it. All three of the boys held drawn revolvers in their hands.

"Let 'em have it!" cried Leon and the three automatic guns spoke almost as if they were one piece.