along, as well as the indentation of his knees in the soil.

Presently they arrived at the terminus of the stone wall, about the only thing remaining intact connected with the French farm. There was not a single tree showing signs of life in that patch of sombre forest; where shell-fire had failed to do the work of destruction a malicious hand had girdled the trunk with a keen-edged tool, and thus encompassed the doom of the trees.

Tom came to a pause.

"I reckon we've come far enough," he said, taking a look over toward the fragment of a house on the slight elevation, which could just be seen from their present position.

"I'd have liked to catch up with that duck and march him back to camp, along with his feathered messengers," Jack grumbled disappointedly. "Somehow I hate and despise a spy above all created things."

The youths set their faces once more in the direction of the ruins, where they soon arrived. Jack half feared that in spite of them the cage and its feathered inmates had been spirited away. He hastened inside ahead of his companion and then called out cheerily:

"It's all right, Tom, and nobody at home. Here's the wicker cage and the pigeons, just as we left them!"

"As the afternoon is passing, and we have a long distance to go, we'd better be making a start," Tom remarked, when he reached the open door.

"Let me carry the pigeon cage, Tom, as you have the gun," suggested Jack, after slipping his hand through the ring at the top. "Say, perhaps the boys won't give us a laugh, to see what queer game we've brought back from our hunt!"

They left the ruins of the once peaceful farmhouse behind them, and commenced retracing their steps. Tom was too old a hand at hunting to get lost. He had kept his bearings through the whole tramp, no matter how many turns they took in examining some promising ground where rabbit burrows might be found. On this account then he would have no difficulty whatever in leading his comrade straight back to the villa in which the entire Lafayette Escadrille of American fliers was quartered.

They were passing along about half a mile from the wrecked farmhouse kitchen, and not far from the spot where Tom made his successful shot, when without warning the report of a gun came to their ears. Jack involuntarily ducked his head.

"Say, did you hear that whining sound just over us, Tom? That was caused by a bullet skipping past!"

Tom for answer dragged his chum down behind a fringe of dead bushes that chanced to lie close by.

"It was a bullet, all right, Jack," he replied, not without a tremor in his voice, for this thing of being made a target by some murderous unseen person was a new and novel experience.

"Do you suppose it was fired by the man who owns these pigeons?" further questioned Jack, though showing no intention of loosening his grip on the wicker cage.

"It could hardly be any one else. He has dogged us this far, or else just happened to catch sight of us. That shot was fired from a distance, and if we take a notion to run he couldn't possibly hit us. But we might as well make use of this fringe of bushes to creep some way off. Then we'll get on our feet and put out for home at full speed."

This they proceeded to do without further delay. When it was no longer possible to utilize the bushes for cover, they sprang to their feet and ran. Jack fully anticipated hearing other shots–yes, and perhaps having more leaden missiles singing their vicious songs about his head. But he was agreeably disappointed in his expectations, for not a report came.

Evidently the spy had gone away, thinking discretion the better part of valor. He may have noticed that they were in uniform, and armed in the bargain.

Later on the air service boys moderated their mad pace, and as there seemed to be no further signs of danger they finally fell into a walk. Still neither of them lagged, but kept up a brisk pace, Jack casting numerous apprehensive glances over his shoulder, haunted by a lingering suspicion that the spy might yet give them trouble.

They came through safely at last. The villa in which the American fliers were quartered was reached, and seemed to be deserted at that hour in the afternoon. Everybody must be busy at the front, the boys concluded, for the din was more distracting than usual.

"We picked out a bad day for getting off, I'm afraid, Tom," Jack sighed. "They told us there was nothing big in prospect; but since we started out on our hunt I guess the Huns have put up something of size. And the boys will be in the thick of it all too! We might have had a share if we'd been on duty to-day."

"Brace up, Jack," chided his chum. "For all you know, what we've done may turn out to be ten times more important than all the work of the entire escadrille to-day. These captured birds and that cipher message, represent possibilities beyond anything you or I can know. Leave all that to the general."

"When do you mean to see him, Tom?"

"As soon as I can arrange it. And you're coming with me when I get the summons to his headquarters, depend on that, Jack. Your part in this affair is just as important as mine."

Tom put the cage with its cooing inmates in their room. Then he started out to try to get into communication with the commanding general. He had met him once by mere chance, but he hardly believed General Petain would remember him in the least.

The action was about over for the day. The Crown Prince had once again thrown a heavy storming party forward in the endeavor to make a breach in the French lines, through which he could pour the veteran reserves he had in waiting. But, as had often happened before, he counted without his host; and when the sun went down all he had to show for his stroke was a greatly increased casualty list.

The French could not be moved.

Tom understood how to go about it, and in the end managed to get an obliging French captain whom he knew very well, to carry a message to the commander-in-chief to the effect that he had news of great importance to communicate. Just as Tom expected would be the case, this brought back a speedy answer.

"You are both to come with me, young Messieurs," said the captain, his eyes sparkling with interest, for Tom had told him enough to excite his curiosity, and he knew the Americans would not aimlessly take up the precious time of the general. "Our valiant commander is tired after a strenuous day; but never is he too weary to attend to duty; and he already finds himself interested in everything you brave young airmen attempt. So please accompany me to headquarters."

Shortly afterwards the boys found themselves face to face with General Petain.

CHAPTER IV
PRAISE FROM THE GENERAL

General Petain received the pair with his accustomed kindness. He loved youth, and his eyes sparkled with pleasure as he gave each of them a hand.

"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 great republic across the sea will decide to cast her decisive influence into the scales to bring us the victory we await with much patience. Tell me now what this strange thing is you have come across to-day."

Tom waited for no second bidding. He realized how tired the general must be after a strenuous day in keeping his finger on the pulse of the whole front, where the fierce German attacks had been hurled without success.

Accordingly he started at once his tale of how they had been given a day off for rest, and, having a love