The machine-gun nests resembled anti-lion burrows in the African soil, tiny dimples in the earth, lined with sandbags. He could not count them in the brief seconds left to him, there were so many. Instead, he picked out the anti-aircraft guns, standing tall and ungainly as giraffes on their circular baseplates, the long barrels already pointed skywards, ready to hurl their air-burst shrapnel as high as 20,000 feet into the sky.

They were waiting. They knew that sooner or later the planes would come, and they were ready. Michael realized that the mist had won them only seconds, for he could see the gunners running to man their weapons. One of the long anti-aircraft barrels began to move, depressing and swinging towards them. Then, as Michael pushed the throttle lever hard open against its stop and the Sopwith surged forward, he saw a cloud of white steam spurt from the massive winch as the ground crew began desperately to haul the balloon down into the protective fire of the banks of guns. The shimmering sphere of silk sank swiftly towards the earth, and Andrew lifted the nose of his machine and roared upwards.

With the throttle wide open and the big rotary engine howling in full power, Michael followed him up, aiming his climb at the cable halfway between the earth and the balloon, at the spot where the balloon would be when he reached it, and that was a mere 500 feet above the heads of the gunners.

Andrew was four hundred yards ahead of Michael, and still the guns had not opened up. Now he was on line with the balloon and engaging it. Michael clearly heard the clatter of his Vickers and saw the streaking phosphorous trails of the incendiary bullets, lacing through the icy dawn air, joining the balloon and the racing green aircraft for fleeting seconds. Then Andrew banked away, his wingtip brushed the billowing silk and it rocked sedately in his slipstream.

Now it was Michael's turn, and as he picked up the balloon in his gunsight, the gunners below him opened up. He heard the rip-crash of shrapnel bursts, and the Sopwith rocked dangerously in the tornado of passing shot, but the shells were all fused too long. They burst in bright silver balls of smoke three or four hundred feet above him.

The machine-gunners were more accurate, for they were at almost point-blank range. Michael felt the solid his plane, and tracer flew thick and crash of shot into white as hail about him. He hit the rudder bar and at the same time threw on opposite stick, crossing controls to induce a gut-wrenching side-slip, throwing off the sheets of fire for a moment while he lined up for the balloon.

It seemed to rush towards him, the silk had the repulsively soft sheen of a maggot coated in silver mucus. He saw the two German observers dangling in their open wicker basket, both of them bundled in clothing against the cold. One stared at him woodenly, the other's face was contorted with terror and fury as he screamed a curse or a challenge that was lost in the blare of engines and the rattling clatter of machine-gun fire.

it was barely necessary to aim the Vickers, for the balloon filled all his vision. Michael opened the safety lock and pressed down on the firing lever; the gun hammered, shaking the entire aircraft, and the smoke of burning phosphorus from the incendiary bullet blew back into his face, choking him.

Now that he was flying straight and level, the ground gunners found him again, shooting the Sopwith to tatters - but Michael held on, pressing on alternate rudders to wing his nose slightly from side to side, directing his incendiaries into the balloon as though he was wielding a garden hose.

Burn! he screamed. Burn! Damn you, burn! Pure hydrogen gas is not inflammable, it has to mix with oxygen in proportions of I:2 before it becomes violently explosive. The balloon absorbed his fire without visible effect.

Burn! he screamed at it. His clawed hand locked on the firing handle, the Vickers hammering, and the spent brass shells spewing from the breech. Hydrogen must be pouring from the hundreds of bullet holes that both he and Andrew had shot in the silk, the gas must be mingling with the air.

Why won't you burn?" He heard the anguish and despair in his own wild cry. He was on the balloon, he must break away now, he must turn to avoid collision, it had all been in vain. Then, in that instant of failure, he knew that he would never give up. He knew he was going to fly into the balloon if he had to.

As he thought it, the balloon exploded in his face. it seemed to swell to a hundred times its size to fill the sky and at the same time turn to flame. A stunning dragon's breath licked over Michael and the Sopwith, scorching the exposed skin of his cheeks, blinding him, flinging both man and machine aloft like a green leaf from a garden bonfire. Michael fought for control as the Sopwith tried to turn on her back, then tumbled down the sky. He caught her before she smashed into the earth and as he climbed away he looked back.

The hydrogen gas had burned away in that single demoniac gust, and now the empty, fiercely burning silk shroud collapsed, spreading like a fiery umbrella over the basket and its human cargo.

One of the German observers jumped clear and fell 300 feet, his greatcoat fluttering about him, his legs kicking convulsively, disappearing abruptly, without sound or The second trace, into the short green grass of the field.

observer stayed with the basket and was enveloped by the billows of burning silk.

On the ground the crew were scrambling from the winch emplacement, like insects from a disturbed nest, but the burning silk fell too swiftly, trapping them in its fiery folds. Michael felt no pity for any of them, but was overcome instead by a savage triumph, a primeval reaction from his own terror. He opened his mouth to shout his warcry, and at that moment a shrapnel shell, fired from one of the guns near the north edge of the field, burst beneath the Sopwith.

Again it was tossed upwards, and humming, hissing shards of steel tore up through the belly of the fuselage.

As Michael struggled to control this second wild surge and drop, the floor of the cockpit was ripped open so that he could see the ground below him and arctic winds howled up under his greatcoat, making the folds billow.

He held her on even keel, but she was hard-hit. Something was loose below the fuselage, it banged and whipped in the wind and she was flying one wing heavy, so he had to hold her up by brute force, but at least he was out of range of the guns at last.

Then Andrew appeared on his wingtip, craning across at him anxiously, and Michael grinned and whooped with triumph. Andrew was signalling for his attention, and stabbing his thumb in the signal, Return to base! Michael glanced around him. While he had been fighting for control, they had been roaring northwards, deeper and still deeper into German territory. They flashed over a crossroads jammed with animal-drawn and motorized transport, startled field-grey figures scattered for cover in the ditches. Michael ignored them and swivelled in the cockpit; three miles away across the flat and featureless green fields the second balloon still sailed serenely above the ridges.

Michael gave Andrew the cut-out negative and pointed at the remaining balloon. No, continue the attack. Andrew's signal was urgent. Return to base! and he A pointed at Michael's machine, and gave him the cutthroat signal.

Danger! Michael looked down through the hole between his feet where the belly had been shot out of her. That banging was probably one of his landing wheels dangling on the bracing wires. Bullet holes had peppered the wings and body of the aircraft, and loose ribbons of torn fabric fluttered like Buddhist prayer flags as the slipstream plucked at them, but the Le Rhone engine roared angrily, still under full throttle, without check or stutter in its warlike beat.