"Donnerwetter!" grunted the corporal. "So much for the bloodhound, and Herr Major is ever boasting of what the brute can do. He's wrong for once at least, only I dare not tell him so. Tell the Belgian to come down. I'll soon send him up another tree a little further on."

"That's right," agreed Max. "Make the fellow work till he drops. If he breaks his neck there's one of the rabble the less."

At the order the climber descended, as before paying no heed to the three officers. Upon regaining the ground he was marched off to make another ascent on a useless search. An hour later, having, as they thought, thoroughly searched the wood, the patrol withdrew, cursing and grumbling at their ill-luck, since, it appeared, a reward of two hundred and fifty marks for the arrest of the fugitives had been offered.

"A proper sport, that Belgian," said Fuller in a whisper, realising the wisdom of speaking in a low tone lest the Huns had left men to guard the woods. "He could have given us away as easy as winking."

"Perhaps he'll inform the Boches now he's out of sight," hazarded the cautious A.P.

"Great Scott! I hope not," e.j.a.c.u.l.a.t.ed Fuller. "In fact I'm willing to lay long odds that he won't. I'd like to meet that chap on the quiet again. I'd make it worth his while."

"So would I," added Barcroft. "Well, this affair has done us a good turn. The Huns have evidently satisfied themselves that we are not anywhere in this wood. The coast will be clear for to-night. How's that arm, old bird?"

"Feeling a bit stiff," replied Fuller. "The air's so confoundedly cold."

"It is a bit fresh," agreed Kirkwood. "And probably it will freeze hard to-night. And your ankle?"

"Can't feel any sensation in it," replied the flight-lieutenant.

"The damage, if any, will a.s.sert itself when I place foot to ground.

What an a.s.s I was not to have brought my Thermos. Full of good old hot tea, too. I left it on the bank, after the smash."

"You deserve a vote of censure for importing food stuffs into German-occupied territory, old man," said Barcroft. "Can't you imagine a thirsty Hun mopping that stuff?"

"You speak for yourself, my festive," retorted the flight-lieutenant. "What did you do with _your_ flasks?"

"They went down with the wreckage," replied Billy.

"Yours, perhaps," said Kirkwood. "My Thermos got smashed when we crashed. I heard the gla.s.s go, and I remember the hot liquid escaping and running over my gloves."

"Then you are all right for a feast," retorted Fuller. "Goatskin soaked in tea, eh? Sort of cannibalistic feast."

"Don't insinuate that I'm a giddy goat," protested the A.P. "It is like a case of--oh, dash it all!"

Kirkwood's exclamation was occasioned by the binoculars slipping from his benumbed fingers and falling to the ground. Rolling a few feet they lay in clear view silent evidence to the hiding place of their owner.

"Then you are a goat--that proves it," said Fuller. "Hullo! What's the move?"

Kirkwood slipping out of his leather coat, was already about to descend to retrieve his lost property. So far the coast seemed clear, for the Belgian labourers and their guards had moved to a field beyond range of vision. Since it was safe to conjecture that they would return to the farm buildings for the night the danger lay in the fact that they would almost a.s.suredly spot the conspicuous binoculars as they repa.s.sed.

The A.P. dropped after swarming down about twenty feet of trunk and alighted softly. His first care was to obliterate his footprints in the bare earth, for the ground surrounding the tree trunk was absolutely devoid of gra.s.s, and although sufficiently hard to withstand the impression of a person walking it was not proof against the impact of a man wearing a pair of heavy boots and dropping from a height of seven or eight feet.

Then, crouching, he made his way towards his cherished binoculars.

Just as he picked them up and placed them in his pocket, for he had left the sling case with his comrades, there was a rustling in the undergrowth. The next instant a huge dog, growling savagely, leapt upon him.

The animal was of the lurcher breed--a type encouraged in the German army for various duties, including field ambulance work, guarding and tracking prisoners and drawing machine-guns. Although smaller than the bloodhound it possessed greater swiftness, while its strength and ferocity were only slightly inferior.

Luckily Kirkwood did not lose his presence of mind. Used to dogs, the experience he had had with playful canines would be turned to good account.

Clenching his leather-gloved hand the A.P. let out with his left.

His fist, taking the lurcher fairly on the point of the nose, sent the animal reeling. The respite was but momentary. Like a dart the dog flew straight for the young officer's throat.

Kirkwood met the animal as it leapt in midair. His right hand, with its protection of the undressed leather gripped the lurcher round the muzzle, his fingers and thumb meeting inside the brute's wide-open jaws. Instantly the A.P.'s left hand grasped the dog's lower jaw.

So far so good. The animal, unable to bite, attempted to shake himself clear. Foiled in this direction he planted his hind legs firmly in the ground and, giving his body a series of jerks, sought to pull the A.P. off his balance.

"Shoot the brute!" exclaimed Barcroft from above. "Risk it! It can't be helped. Clap the muzzle close to the brute's hide."

But Bobby thought otherwise. Even if he could afford the risk of letting go the dog's jaws with one hand and draw his revolver the m.u.f.fled report would still be sufficiently audible to alarm the Huns.

For perhaps half a minute he stood his ground, contenting himself by prising the lurcher's jaws apart. Then, slowly at first, he began to bend the animal's head backwards. It was a horrible yet necessary task--one that taxed the A.P.'s strength and endurance to the uttermost. Already he could feel the dog's teeth penetrating the gloves, and those saliva-streaming fangs meant trouble once they pierced the flesh.

Yet the man was winning through. Back and back he levered the animal's head. The brute's breath was coming in short, irregular pants; its blood-flecked eyes were almost bursting from their sockets. Still it struggled furiously, striving in vain to break away from the A.P.'s vice-like grip.

"By Jove! He'll never do it," thought Barcroft. "The brute's tiring him out."

At the risk of barked shins and elbows the flight-sub descended from his perch. Gaining the ground he drew his revolver, wrapped his scarf several times round the weapon to m.u.f.fle the sound of the explosion, and cautiously approached the combatants.

Extreme care was necessary, for the lurcher, driven to desperation, was turning his antagonist round and round. Kirkwood, his whole energies devoted to twisting the animal's neck, was unable to counteract the dog's movements, nor did the animal remain sufficiently still to enable Barcroft to plant the muzzle of his weapon firmly against its ribs.

The end came with unexpected suddenness.

With a distinctly audible crash the lurcher's vertebra snapped. Its body seemed instantly to grow limp. The sudden cessation of resistance caused Kirkwood to fall forward across the still quivering body of his enemy.

Barcroft lifted his chum and set him on his feet. The A.P., now the duel with death was done, was as pale as a sheet and trembling in every limb.

"I'll be all right in a minute," he gasped. "Feel as ill as a seasick cat."

"Sit down," ordered Billy, and grasping his comrade by the nape of the neck he bent his head until it rested on his knees.

"Keep like that a while," he continued. "I'll get rid of incriminating evidence. My word, what a lump!" he added, as he lifted the dead brute by its hind legs. "Half a hundredweight, I should imagine."

Keeping the carca.s.s clear of the ground the flight-sub carried it quite fifty yards through the wood before depositing it under a bush.

This necessary task performed, he retraced his steps.

"Chirpy again?" he inquired.

"Quite," replied Kirkwood.

"You look jolly warm," continued Barcroft.

"I feel it."

"Then get a move on and swarm up here," interrupted Fuller's voice.

"I'm as cold as charity and could do with a human warmingpan.

"All clear?" inquired Barcroft.

"By Jove, no!" was Fuller's hurried rejoinder. "Look sharp, you fellows. There are half a dozen of 'em coming this way."