The Germans were so intent on the bursting high explosive beneath them that they were oblivious of the deadly formation closing swiftly from above. Suddenly the young pilot nearest Michael grinned with delight and relief and pointed ahead. He had seen the Rumpler at last.

Andrew pumped his fist over his head in the old cavalry command, Charge! and the youngster put his nose down without closing the throttle. The Sopwith went into a howling dive so abrupt that Michael winced as he saw the double wings bend back under the strain and the fabric wrinkle at the wing roots. The second novice followed him just as precipitously. They reminded Michael of two half-grown lion cubs he had once watched trying to bring down a scarred old zebra stallion, falling over themselves in comical confusion as the stallion avoided them with disdain.

Both the novice pilots opened fire at a range of a thousand yards, and the German pilot looked up at this timely warning; then, judging his moment, he banked under the noses of the diving scoutplanes, forcing them into a blundering overshoot that carried them, still firing wildly, half a mile beyond their intended victim. Michael could see their heads screwing around desperately in the open cockpits as they tried to find the Rumpler again.

Andrew shook his head sadly and led Michael down.

They dropped neatly under the Rumpler's tailplane, and the German pilot banked steeply to port in a climbing turn to give his rear gunner a shot at them. Together Andrew and Michael turned out in the opposite direction to frustrate him, but as soon as the German pilot realized the manoeuvre had failed and corrected his bank, they whipped the Sopwiths hard over and crossed his stern.

Andrew was leading. He fired one short burst with the Vickers at a hundred feet and the German rear gunner bucked and flung his arms open, letting the Spandau machine-gun swivel aimlessly on its mounting as the .303 bullets cut him to pieces. The German pilot tried to dive away, and Andrew's Sopwith almost collided with his top wing as he passed over him.

Then Michael came in. He judged the deflection of the diving Rumpler, touched his port rudder bar so that his machine yawed fractionally just as though he were swinging a shotgun on a rocketing snipe, and he hooked the forefinger of his right hand under the safety bar of the Vickers and fired a short burst, a flurry of .303 ball. He saw the fabric of the Rumpler's fuselage ripped to tatters just below the rim of the pilot's cockpit, in line with where his upper body must be.

The German was twisted around staring at Michael from a distance of a mere fifty feet. Michael could see that his eyes behind the lens of his goggles were a startled blue, and that he had not shaved that morning, for his chin was covered with a short golden stubble. He opened his mouth as the shots hit, and the blood from his shattered lungs blew out between his lips and turned to pink smoke in the Rumpler's slipstream, and then Michael was past and climbing away. The Rumpler rolled sluggishly on to its back and with the dead men lolling in their straps, fell away towards the earth. It struck in the centre of an open field and collapsed in a pathetic welter of fabric and shattered struts.

As Michael settled his Sopwith back into position on Andrew's wingtip, Andrew looked across at him, nodded matter-of-factly, and then signalled him to help round up the two new chums who were still searching in frantic circles for the vanished Rumpler. This took longer than either of them anticipated, and by the time they had them safely under their protection again, the whole formation had drifted further west than either Andrew or Michael had ever flown before. On the horizon Michael could make out the fat shiny serpent of the Somme river winding across the green littoral on its way down to the sea.

They turned away from it and headed back east towards Arras, climbing steadily to reduce the chances of an attack from above by a Fokker Jagdstaffel.

As they gained height, so the vast panorama of northern France and southern Belgium opened beneath them, the fields a patchwork of a dozen shades of green interspersed with the dark brown of ploughed lands. The actual battle lines were hard to distinguish; from so high, the narrow ribbon of shell-churned earth appeared insignificant, and the misery and the mud and the death down there seemed illusory.

The two veteran pilots never ceased for an instant their search of the sky and the spaces beneath them. Their heads turned to a set rhythm in their scan, their eyes never still, never allowed to focus short or become mesmerized by the fan of the spinning propellor in front of them. In contrast, the two novices were carefree and selfcongratulatory. Every time Michael glanced across in their direction they grinned and waved cheerfully. In the end he gave up trying to urge them to search the skies around them, they did not understand his signals.

They leveled out at 15,000 feet, the effective ceiling of the Sopwiths, and the sense of unease that had haunted Michael while he had been flying at low altitude over unfamiliar territory passed as he saw the town of Arras abeam of them. He knew that no Fokker could be lurking above them in that pretty bank of cumulus, they simply did not have the ability to fly that high.

He swept another searching glance along the lines.

There were two German observation balloons just south of Mons, while below them a friendly flight of DH2 single-seaters was heading back towards Amiens, which meant they were from No. 24 Squadron.

In ten minutes they would be landing, Michael never finished the thought, for suddenly and miraculously the sky all around him was filled with gaudily painted aircraft and the chatter of Spandau machine-guns.

Even in his utter bewilderment Michael reacted reflexively. As he pulled the Sopwith into a maximum-rate turn, a shark-shaped machine checkered red and black with a grinning white skull superimposed on its black Maltese cross insignia flashed across his nose. A hundredth of a second later and its Spandaus would have savaged Michael. They had come from above, Michael realized; even though he could not believe it, they had been above the Sopwiths, they had come out of the cloud bank.

One of them, painted red as blood, settled on Andrew's tail, its Spandaus already shredding and clawing away the trailing edge of the lower wing, and swinging inexorably towards where Andrew crouched in the open cockpit, his face a white blob beneath the tam al shanter and the green scarf. Instinctively, Michael drove at him, and the German, rather than risk collision, swung away.

Ngi dIa! Michael shouted the Zulu warcry as'he came on to the killing quarter on the tail of the red machine, and then in disbelief watched it power away before he could bring the Vickers to bear. The Sopwith juddered brutally to the strike of shot and a rigging wire above his head parted with a twang like a released bow string as another one of these terrible machines attacked across his stern.

He broke away and Andrew was below him, trying to climb away from yet another German machine which was swiftly overhauling him, coming up within an ace of the killing line. Michael went at the German head-on and the red and black wings flickered past his head, but instantly there was another German to replace him, and this time Michael could not shake him off, the bright machine was too fast, too powerful, and Michael knew he was a dead man.

Abruptly the stream of Spandau fire ceased, and Andrew plunged past Michael's wingtip, driving the German off him. Desperately Michael followed Andrew around, and they went into the defensive circle, each of them covering the other's belly and tail while the cloud of German aircraft milled around them in murderous frustration.

Only part of Michael's mind recorded the fact that both the new chums were dead. They had died in the first seconds of the assault; one was in a vertical dive under full power, the maimed Sopwith's wings buckling under the strain and at last tearing away completely, while the other was a burning torch, smearing a thick pall of black smoke down the sky as it fell.