By Jove! you'll have to explain those scratches when you return to your virtuous home."

Philip Entwistle merely responded with "Yes" with a preoccupied air.

His work in connection with the affair had only just begun. Although a veterinary surgeon he was also an accredited member of the Secret Service, and upon the _soi-disant_ Andrew Norton's arrival at Tarleigh as a new resident he had been informed of the suspicious nature of the newcomer. It was by design that he had misdirected Barcroft in the matter of the wrong train on the eve of the Barborough Zeppelin raid; but that was owing to the fact that he had mistaken the occupier of Ladybird Fold for the suspect, von Eitelwurmer.

Now arose the difficulty. Could he warn Barcroft of the dangerous character of the spy, without prejudice to his plans? At present it was undesirable, even on the d.a.m.ning evidence he had found at the spy's house, to cause von Eitelwurmer to be arrested. Better to let the fellow prosecute his activities a little longer, complete the chain of evidence and rope in his accomplices, if any, than to make the spy a prisoner without being able to make a clean sweep of all his works. Premature action would mar the elaborate ma.s.s of evidence that Entwistle was on the road to collect--evidence that would be far-reaching as far as the network of German espionage in England was concerned.

So for the present he decided to keep his own counsel regarding Andrew Norton. Not even a hint would he throw out concerning the tenant of The Croft. If he did so, Barcroft could not help showing antipathy to his friend Norton, and the latter, scenting danger, would be doubly wary.

Yet, knowing that there was a price on Peter Barcroft's head, although he did not as yet connect Norton's presence at Tarleigh with the Kaiser's blood-moneyed decree, Entwistle realised that he would have to keep a watchful eye upon his newly-found friend in order to guard him from the possibility of impending peril.

CHAPTER XXV

THE BOMBING EXPEDITION

OFF Zeebrugge once more. In the pale grey dawn of a November morning yet another strafing operation was about to take place. The Huns, who had converted the peaceful little Belgian fishing port into a hornets' nest, were to be allowed no rest.

Approaching the coast, the undulating dunes of which were just visible against the pale light of the eastern sky, were eight monitors, their powerful guns c.o.c.ked up at a grotesque angle in readiness to open fire at a six-mile range. At a considerable distance astern were the seaplane-carriers "Hippodrome," "Arena" and "Cursus," while in a far-flung line ahead, astern and abeam, were the swarm of destroyers and patrol boats whose mission it was to promptly "scotch" any U-boat that, more daring than the rest of the cowardly crew, might attempt to let loose a torpedo at the converted liners. Already the Hun had learnt the lesson that it was almost a matter of impossibility to sink a monitor by torpedo, even though the weapons were "set" to run only a few feet beneath the surface.

Coupled with the knowledge of the fact that it was "unhealthy" to be anywhere in the vicinity of craft flying the White Ensign, when there were others proudly displaying the Red Ensign and which were practically incapable of defence, the U-boats took good care to give the bombarding flotilla a wide berth.

Already the "Arena" and "Cursus" had dispatched their complement of seaplanes for the purpose of registering the result of the monitors'

fire, but up to the present the airmen on board the "Hippodrome" had received no orders to board their respective "buses" and hie them to the scene of action.

"They've opened the ball," exclaimed Kirkwood, as the monitor on the left of the line let fly with her 14-inch gun.

"An obvious performance," remarked Fuller. "Unless one were both blind and deaf. More to the point: why are we being held in reserve, I wonder?"

"Dunno," added another flying-officer. "In the case of you three fellows there might be a plausible explanation. You've been so jolly keen on getting away from the ship that the skipper won't give you another chance. By Jove! That was a good one!"

Somewhere in the vicinity of Zeebrugge a dense cloud of black smoke had been hurled hundreds of feet into the air. One of the British sh.e.l.ls had found a particularly satisfying target, for either a petrol dept or an ammunition "dump" had been sent sky-high, with, possibly, a few hundred Huns to boot.

Yet no sound of the explosion could be heard, for the monitors' guns outvoiced that. The coast-defence craft were letting fly as quickly as the hydraulic loaders performed their task, and the gigantic yet docile weapons could be trained upon the practically invisible objective.

It was by no means a one-sided action. From cunningly concealed sh.o.r.e batteries, that seemed to multiply with hydra-headed persistence, German sh.e.l.ls hurtled through the air, for the most part ricochetting harmlessly. A few, however, "got home." One monitor, listing badly to starboard, was already crawling slowly out of range. Another had been set on fire, but, the conflagration being quickly subdued, she "carried on" with calm and awful deliberation.

It had been one of the tenets of war that armoured ships were more than a match for sh.o.r.e batteries. The mobility of the former and the knowledge of the fixed position of the latter accounted for the theory--a theory that had been justified by the bombardment of Alexandria. But in the greatest war that the world has yet seen this idea received a rude shock. The skill with which huge guns can be loaded, ranged and trained upon a moving target rather more than equalised matters. Thus the old forts on the Dardanelles were quickly reduced to a heap of ruins by the guns of the "Queen Elizabeth," but this did not prevent the Turks bringing heavier ordnance to bear upon the Allied squadrons as they attempted in vain to force the historic Straits.

But there has been yet another swing of the pendulum. In an engagement betwixt ships and forts there was a deciding factor--the command of the air. Provided airmen from the attacking squadron could a.s.sist by observing the hits of the naval guns and by dropping quant.i.ties of powerful explosives on the hostile batteries the advantage would rest with those who held command of the sea. Nor was mere observing and bomb-dropping on defended positions sufficient.

It was necessary to hara.s.s the enemy's lines of communication and prevent reserves of men and ammunition being rushed up to the coast.

"Ten to one we're down for a 'stunt,'" hazarded Barcroft. "That's why we are cooling our heels here. Ah! I thought so," he added, as the airmen were summoned to receive instructions preparatory to a flight.

A quarter of an hour later Billy Barcroft felt like dancing a hornpipe on the quarter-deck. He had been given a task after his own heart--to bomb the German hangars at Lierre, a town about six or seven miles south-east of the fortress of Antwerp and a distance of eighty miles, as the crow flies, from the position taken up by the seaplane carriers. To Fuller was deputed the business of wrecking the important railway station of Aerschot, while the other pilots were likewise given definite instructions to drop their cargoes of explosives on specified places of military importance. The airmen were enjoined to avoid as far as possible encounters with hostile machines on the outward journey, the importance of reaching their respective objectives being paramount to the excitement of aerial duels with Hun flying men.

"We'll be within sight of one another most of the time, Barcroft, old man," said Fuller, as he signed to his observer to take his place in the machine. "Now, Gregory, all ready?"

Fuller's companion, a sparely-built sub-lieutenant, whose long, hooked nose and obliquely placed eyes gave him the appearance of a bird, nodded a.s.sent.

"Well, good luck!" shouted Barcroft.

The words were drowned by the roar of the engine, but the lieutenant instinctively realised their meaning. With a cheery wave of his gauntletted hand he started on his long flight.

Thirty-seconds later Barcroft got away, with Kirkwood as his observer. There had been a slight rivalry between Billy and Fuller as to who should take the A.P., for the lieutenant had regarded the latter as his own right-hand man since the night of the encounter with the Zeppelins, while Barcroft claimed priority. The matter had been decided by the spin of a coin, with the result that the A.P.

was now on his way to Lierre with Barcroft.

High above the bombarding monitors flew the powerfully engined seaplane, now nearly half a mile in the wake of Fuller's "bus." At regular intervals astern came the rest of the aerial raiders, all rocking slightly in the disturbed air caused by the concussion of the heavy guns.

Ten minutes were sufficient to bring Barcroft's machine over the Belgian coast. Acting upon previous instructions he maintained an alt.i.tude of eleven thousand feet, at which height it was practically invisible from the sh.o.r.e, across which clouds of smoke and dust were slowly drifting as the British sh.e.l.ls burst with devastating effect upon the Huns' positions.

No Archibalds greeted the raiders; neither Fokkers nor Aviatiks appeared to bar their way. For the present the flight was nothing more than an exhilarating joy-ride.

Once Kirkwood turned his head to watch the following seaplanes. Only one was in sight. The rest had already turned off for their respective objectives, and even that one was beginning to plane down towards a broad ca.n.a.l on which were dozens of loaded barges, their cargoes consisting of heavy gun ammunition destined for the batteries of Zeebrugge and Ostend.

For the present the A.P.'s task was practically a sinecure. There was no necessity to use the wireless instrument: two hundred feet of trail ing aerial wire is apt to be in the way during bomb-dropping operations; besides, the raiding seaplane, not having to register for the guns of the fleet, could refrain from reporting progress until her return to her parent ship. So having made sure as far as possible that the bomb dropping gear was in working order this time, and having fitted a tray of ammunition to the Lewis gun in order to be ready for use in case of emergencies, Kirkwood leant over the side of the fuselage and contemplated the country beneath; the features of which as seen from the air he knew better by this time than any of his native land.

From Ghent Barcroft followed the course of the River Scheldt until the town of Antwerp appeared in sight. At this point Fuller was observed to be turning away to the right. Both seaplanes were approaching their respective objectives.

"Bestir yourself, you lazy bounder!" shouted Billy through the voice tube. "There's something ahead. Looks like a balloon. Get your gla.s.ses and see what it is."

"It is a balloon," declared Kirkwood after a brief inspection. "A captive one."

"And right over the Lierre hangars," thought the pilot. "What for?

There's nothing to observe from a belligerent point of view, unless the bounders are expecting us. It may be that the balloon is in use for instructional purposes. If so, I'll give the young pups cold feet, by Jove!"

"They've spotted us," announced the A.P. "They've begun to haul the thing down."

"Then they are too late," added Barcroft grimly. "Gun all right?

Stand by to give 'em a tray."

Tilting the ailerons the pilot swooped down towards the unwieldy, tethered gas-bag. As he did so mushrooms of white smoke burst into view all around the descending seaplane. The German anti-aircraft guns were firing upon the British raiders.

Barcroft held steadily on his course. He was quite used to shrapnel by this time. He knew, too, that soon the Hun gunners would have to cease fire for fear of hitting their own captive balloon.

Already the German officers in the car of the balloon realised that it was impossible for the gas-bag to be hauled down in time. Three of them leapt into s.p.a.ce. The fourth remained, grasping the edge of the basket-work and staring terror-stricken at the approaching seaplane.

In spite of the tax upon his mental energies Barcroft watched the descent of the three. For nearly two hundred feet they dropped like stone, then they were hidden from his view by three umbrella-like objects. Before taking their desperate leap the Germans had provided themselves with parachutes.

Apparently there was not one left for the remaining Hun. Suspended betwixt earth and sky he realised the horror of his position, until, seized by a forlorn resolve, he clambered over the side of the car and began to swarm down the wire rope that held it in captivity.

It was hopeless from the first. In spite of the protection afforded by the leather gloves. The metal wire cut into his palms like hot iron. Before the luckless German had lowered himself fifty feet his grip relaxed. Like an arrow he crashed to the ground, a thousand feet below.

"Don't fire!" ordered the flight-sub, realising that if merely perforated by small-calibre bullets the gas-bag would fall harmlessly to earth. "Stand by to drop a plum--now."

The A.P. jerked the releasing lever. As he did so Barcroft set the seaplane to climb steeply. Ten seconds later the bomb hit the balloon fairly in the centre of its convex upper surface. The next instant there was a vivid flash, followed by a crash that was audible above the roar of the seaplane's engine. Sideslipping the machine dropped almost vertically. Not until she had pa.s.sed through the outlying portion of the dense cloud of smoke from the destroyed balloon did the pilot regain control.

A hurried glance showed that the flaming wreckage of his victim was plunging earthwards, leaving a fiery trail in its wake. It was falling upon the triple line of sheds in which German aeroplanes were stored.