As miraculously as they had come, the Germans were gone, untouched and invulnerable, they disappeared back towards their own lines, leaving the pair of battered, shot-torn Sopwiths to limp homewards.

Andrew landed ahead of Michael and they parked wingtip to wingtip at the edge of the orchard. Each of them clambered down and walked slowly round his own machine, inspecting the damage. Then at last they stood in front of each other, stony-faced with shock.

Andrew reached into his pocket and brought out the silver flask. He unscrewed the cairngorm and wiped the mouth of the flask with the tail of the green scarf, then handed the flask to Michael.

Here, my boy, he said carefully, have a dram. I think you earned it, I really do. So on the day that Allied superiority was wiped from the skies above France by the shark-nosed AlbatrosD type scoutplanes of the German jagdstaffels, they had become comrades of desperate necessity, flying at each other's wingtips, forming the defensive mutually protective circle whenever the gaily painted minions of death fell upon them. At first they were content merely to defend themselves, then between them they tested the capability of this new and deadly foe, poring together at night over the intelligence reports that belatedly came in to them, learning that the Albatros was driven by a 160 horsepower Mercedes engine, twice as powerful as the Sopwith's Le Rhone, and that it had twin Spandau 7.92 `men machine-guns with interrupter gear firing forward through the arc of the propeller, against the Sopwith's single Vickers .303. They were outgunned and outpowered. The Albatros was 700 pounds heavier than the Pup and could take tremendous weight of shot before it fell out of the sky.

So, old boy, what we'll do is learn to fly the arses off them, Andrew commented, and they went out against the massed formations of the Jastas and they found their weaknesses. There were only two. The Sopwiths could turn inside them, and the Albatros radiator was situated in the upper wing directly above the cockpit. A shot through the tank would send a stream of boiling coolant hissing over the pilot, scalding him to a hideous death.

Using this knowledge, they made their first kills, and found that in testing the Albatros they had tested each other and found no fault there. Comradeship became friendship, which deepened into a love and respect greater than that between brothers of the blood. So now they could sit quietly together in the dawn, drinking coffee laced with whisky, waiting to go out against the balloons, and take comfort and strength from each other.

Spin for it? Michael broke the silence, it was almost time to go.

Andrew flicked a sovereign into the air and slapped it on to the table-top, covering it with his hand.

Heads, said Michael and Andrew lifted his hand.

Luck of a pox-doctor! he grunted, as they both looked down on the stern, bearded profile of George V.

I'll take number-two slot, said Michael, and Andrew opened his mouth to protest.

I won, I call the shot. Michael stood up to end the argument before it began.

Going against the balloons was like walking on to a sleeping puff-adder, that gross and sluggish serpent of the African veld; the first man woke it so that it could arch its neck into the S of the strike, the second man had the long recurved fangs plunged into the flesh of his calf.

With the balloons they had to attack in line astern, the first man alerted the ground defences and the second man received their full fury. Michael had deliberately chosen the number-two slot. If he had won, Andrew would have done the same.

They paused shoulder to shoulder in the door of the mess, pulling on their gauntlets, buttoning their coat's and looking up at the sky, listening to the rolling fury of the guns and judging the breeze.

The mist will hang in the valleys, Michael murmured. The wind won't move it, not yet. Pray for it, my boy, Andrew answered, and, hampered by their clothing, they waddled down the duckboards, to where the Sopwiths stood at the edge of the trees.

How noble they had once appeared in Michael's eyes, but how ugly now when the huge rotary engine, vomiting forward vision, was compared to the Albatros sleek shark-like snout, with its in-line Mercedes engine. How frail when considered against the Germans robust airframe.

God, when are they going to give us real aeroplanes to fly! he grunted, and Andrew did not reply. Too often they had lamented the endless wait for the new SEsa that they had been promised, the Scout Experimental No. 5a that would perhaps allow them to meet the Jastas on equal terms at last.

Andrew's Sopwith was painted bright green, to match his scarf, and the fuselage behind the cockpit was ringed by fourteen white circles, one for each of his confirmed victories, like notches on a sniper's rifle. The aircraft's name was painted on the engine housing: The Flying Haggis.

Michael had chosen bright yellow, and there was a winged tortoise with a worried frown painted below his cockpit and the appeal, Don't ask me, I just work here. His fuselage was ringed by six white circles.

Assisted by their ground crews, they clambered up on to the lower wing, and then eased themselves into the narrow cockpits. Michael settled his feet on to the rudder bars and pumped them left and right, peering back over his shoulder to watch the response of the rudder as he did so. Satisfied, he held up a thumb at his mechanic who had worked most of the night to replace one of the cables shot away on the last sortie. The mechanic grinned and ran to the front of the machine.

Switches off? he called.

Switches off! Michael confirmed, leaning out of the cockpit to peer around the monstrous engine.

Suck in" Suck in! Michael repeated, and worked at the handle of the hand fuel pump. When the mechanic swung the propeller, he heard the suck of fuel into the carburettor under the cowling as the engine primed.

Switches on! ContactV Switches on! At the next swing of the propeller the engine fired and blathered. Blue smoke blew out of the exhaust ports, and there was the stink of burning castor oil. The engine surged, and missed, caught again and settled down to its steady idling beat.

As Michael completed his preflight checks, his stomach rumbled and spasmed with colic. Castor oil lubricated the precision engines, and the fumes they breathed from the exhausts gave them all a perpetual low-grade diarrhoea. The old hands soon learned to control it; whisky had a marvellously binding effect if taken in sufficient quantity. However, the new chums were often affectionately referred to as treacle bottoms, or slippery breeks when they returned red-faced and odorous from a sortie.

Michael settled his goggles and glanced across at Andrew. They nodded at each other, and Andrew opened his throttle and rolled out on to the soggy turf. Michael followed him, his mechanic trotting at his starboard wing tip to help him swing and line up on the narrow muddy strip between the apple trees.

Ahead of him Andrew was airborne and Michael opened his throttle wide. Almost immediately the Sopwith threw her tail up, clearing his forward vision, Michael felt a prick of conscience at his earlier disloyalty. She was a lovely plane and a joy to fly. Despite the sticky mud of the strip, she broke swiftly free of the earth, and at 200 feet Michael levelled out behind Andrew's green machine. The light was just good enough by now for him to make out to his right the green copper-clad spire of the church of the little village of Mort Homme; ahead of him lay the T-shaped grove of oak and beech trees, the long leg of the T perfectly aligned with the squadron's landing strip, a most convenient navigational aid when coming in during bad weather. Beyond the trees stood the pinkroofed chAteau set in the midst of its lawns and formal gardens, and behind the chAteau the low knoll.