"Couldn't help it," replied Barcroft with a broad grin. "If you were in my place and saw a crowd of Hun Staff officers pushing along in motor-cars wouldn't your idea of courtesy lead you to pay them a little attention? Kirkwood gave 'em a couple of plums and a whole drum. Result—a slight increase in the Hun death-rate."

Barcroft had, in fact, gone well inland over the German batteries, on a sort of informal joy-ride. From a height of 5,000 feet the observer had spotted what appeared to be a motor convoy bowling along the road between Zeebrugge and Bruges. With a daring bordering on recklessness the pilot had vol-planed down to within two hundred feet, greatly to the consternation of the grey-cloaked German Staff officers, who, leaving the shelter of their steelroofed cars, scurried with loss of dignity for the safety that was denied most of them. For with admirable precision Kirkwood had dropped two bombs fairly into the line of cars, following up the attack by firing a whole drum of ammunition from the Lewis gun into the fleeing Huns.

Deftly the flexible steel wire from the outswung derrick engaged the lifting hooks of the seaplane. The machine was just clear of the water when the order came "Avast heaving." Simultaneously a bugle blared. It was the call for Flying Officers.

Leaping into the stern sheets of a boat in attendance, Barcroft and Kirkwood were taken to the side of the "Hippodrome," where they gained the deck of the ship. Already Fuller and the rest of the airmen had gone aft. Something was literally in the air.

The signal commander held up a leaf torn from a signal pad.

"A wireless has just come through," he announced in clear deliberate tones. "A hostile plane has made a raid over parts of Kent. She is now on her way back, apparently heading for Ostend. Machines from Eastchurch have started in pursuit, but the Hun has a useful lead. Now, gentlemen, a nod is as good as a wink to a blind horse: we are between the raider and his base."

The assembly dispersed like magic, the airmen hurriedly donning leather jackets and flying helmets and giving peremptory orders to the mechanics in attendance. In less than five minutes the first of the stowed seaplanes was ready to glide down the inclined platform to take to flight.

Yet, from a starting point of view Barcroft had a decided advantage. His seaplane was practically ready. There was enough petrol for a lengthy flight, and a good reserve of ammunition for the Lewis gun. Bombs there were none, nor were any likely to be required for the task in hand. The chances of a hit on a small and rapidly-moving target were very remote. It was by machine-gun fire that the attack upon the returning raider was to be made.

With the motor throbbing noisily and with clouds of oil-smelling smoke pouring from her exhaust, Barcroft's seaplane taxied away from the towering side of her ungainly parent. Then, so gracefully that it was impossible to determine the exact moment when the aircraft ceased to be waterborne, the seaplane rose swiftly and steadily in the air.

Climbing in steep spirals the machine quickly rose to a height of 5,000 feet. It was enough for all practical purposes, allowing a margin of superior altitude to that of the expected Boche.