the watchful gaze of Kemmel, he seemed to be passing through some mysterious land. By day it was hideous enough; but in the dusk the flat dullness of it was transfigured. Each pond with the shadows lying black on its unruffled surface seemed a fairy lake; each gaunt and stunted tree seemed to clothe itself again with rustling leaves. The night was silent; only the rattle of the little train, as it rumbled over bridges which spanned some sluggish brook or with a warning hoot crossed a road—broke the stillness. Great shell-holes filled with rotting debris flashed by, the mouldering ruins of an old château frowned down as they twisted and turned through the grounds where once men had flirted and women had sighed. Now the rose garden was used as a rubbish heap for tins; and by the over-grown sundial, chipped and scarred by a stray shell, two wooden crosses stuck out of the long rank grass. At last they reached the Canal, and the engine stopped near the Lille road.

Close by, the flares lobbed up, green against the night; and a white mist covered the low-lying ground. Across the road lay trees in all directions, while, through the few that remained standing, a cold bright moon threw fantastic shadows. On each side of the road, screened by the embankment from machine-gun fire, sat groups of men waiting for the trains.

At last Vane heard the first one—faintly in the distance. It loomed up suddenly out of the mist and crept across the road. Without a word the men detailed to push it seemed to rise out of the ground. Silently they disappeared with it, like ghouls at some mysterious ceremony. With muffled couplings it made no sound; and in a few minutes it was ready in position, with its leading truck where once the owner of a farm had sat before the fire, after the day's work.

And so they came—eight in all. Any noise—any suspicion on the part of the Boche, a bare quarter of a mile away, and a machine-gun would have swept the ground. But the night was silent, the flares still went peacefully up, and the wind had not changed. It blew gently and steadily towards the German lines. Only there was now just a faint smell of pineapple in the air; one of the cylinders was leaking. . . .

Figures loomed up unexpectedly out of the mist; occasionally a low curse could be heard as a man stumbled into a shell hole. . . .

"Everything all right; everybody clear?" The gas expert peered at Vane in the darkness. "Right! well, let her go."

A series of reports sounded deafeningly loud, as the detonators of the cylinders were fired by electricity; a steady, hissing noise as a great wall of white vapour mingled with the mist and rolled forward towards the Germans. The gas attack had begun. To an airman returning from a bombing raid, who circled for a moment above, it looked like a sheet being slowly spread over the country below; a beautiful—an eerie—picture. To those on the ground who watched it, it seemed as a solid wall of dense fog moving relentlessly forward—like the mist that comes creeping over the Downs till those caught in it can scarce see their hand in front of their face. To the Boche it was death. . . .

Patrols going out the next night found men twisted and blackened with the smell of pineapple still on their swollen lips; in the hospitals behind, men writhed and muttered hoarsely, struggling for breath and struggling in vain. The attack had been successful—and all was as it should be. Undoubtedly the Germans started gas in a country where the prevalent wind was south-west—and it doesn't pay in war to be a fool. . . .

Vane wished that one or two German men of science had been occupying the Boche outpost line instead of. . . . War—modern war!

"It will go clean through their helmets," said the gas expert. "One hour in most cases, and when it gets weaker, twenty-four—or even more. That's the stuff to give 'em."

At last the performance was over, and the trains having delivered the goods returned to their own place.

"Most successful." The gas expert, rubbing his hands together, came up to Vane as he stood on the Lille road. "I think we've got quite a number of the blighters. And not a single casualty!"

"Good," said Vane. "But what a filthy method of fighting."

"The Germans started it," returned the other.

"I know they did," laughed Vane. "That's probably why it's so filthy."

The gas officer looked thoughtful. "I'm not certain that I agree with you, Vane. War is such a filthy business, however you look at it, that one would be a fool not to harness science in every possible way . . ."

"Don't you believe it," scoffed Vane. "Science has harnessed us. We've started the bally motor with the gear in, and now we're running after it trying to catch up. Can I give you a lift back on my private stink machine? . . ."

They strolled up the road together to where the tractor was waiting.

"Man no longer the master of his destiny, you mean?" said his companion.

"Don't make me laugh too loud," returned Vane, "or the Boche might hear; unless you've killed 'em all . . ."

"You're wrong, my friend—utterly wrong." They came to where the railway track crossed the road and he halted to pull out his pipe, before getting on to the little engine.

"I tell you, Vane . . ."

And at that moment a flight of cockchafers seemed to sweep down the road. Vane felt the stinging pain in his right shoulder, and then he looked foolishly at the gas expert . . .

"You were saying," he began . . .

But his late companion had taken a machine-gun bullet through his heart.

CHAPTER I

The beach at Paris Plage is associated in the minds of most people who went there before the war with a certain amount of gaiety. There were bands, and fair ladies, and various other delights generally connected with popular French watering-places. Incidentally the beach is a beach—not a collection of sharp boulders. There is real sand—lots of it; the sort that gets hot and comforting in the sun, and invites people who have eaten too much luncheon to sleep. And during the war, though the bands and other delights have departed, the sand has remained a source of pleasure to hundreds of people in need of a temporary rest cure. They have come from the big hospitals at Etaples; they have come from the officers' rest-house. Some have even come in motor cars from the trenches just for the day, and one and all they have lain on the beach and slept and then departed the better for it.

On a certain afternoon during the height of the German offensive in the spring of 1918 a girl was sitting on the beach staring out to sea. On the horizon a black smudge of smoke stood up against the vivid blue of the sky; while, close in shore, a small sailing boat was barely making headway in the faint breeze.

The girl was a V.A.D., and the large French family which had planted itself close by cast little curious glances at her from time to time. And she was worth looking at, with her fair hair, deep blue eyes and that wonderful complexion which seems to be the exclusive property of the British. Madame remarked on it to Monsieur, glancing at the white faces of her own daughters three, and Monsieur grunted an assent. Personally he was more occupied with the departed glories of Paris Plage than with a mere skin of roses and milk; at least the worthy man may have deemed it desirable to appear so.

"Pauvre petite," went on the kindly matron, "but she looks tired . . . so tired." She heaved a deep sigh. "Mais que voulez-vous? c'est la guerre." She watched her offspring