The work of the camp proceeded all around us as we sat there; it was a hive of activity, as military sites always seem endlessly to be. Most of the soldiers wore a full kit of a jungle-green twill shirt and trousers with anklets; on their heads they had soft felt hats with puggrees of light khaki, or else bush hats of (Gibson said) an Australian design. They wore their divisional insignia sewn into their shirts or hats, and most of them carried weaponry: leather bandoliers for small-arms ammunition, web pouches, and the like. They all bore the heavy epaulets I remembered from 1938. In the heat and moisture, most of these troopers were fairly disheveled.

I saw one chap in a suit of pure white which enclosed him head to foot; he wore thick gloves, and a soft helmet which enclosed his head, with an inset visor through which he peered. He worked at the opened side-panels of one of the Juggernauts. The poor fellow must have been melting of the heat in such an enclosure, I surmised; Gibson explained that the suit was of asbestos, to protect him from engine fires.

Not all the soldiers were men — I should think two-fifths of the hundred or so personnel were female — and many of the soldiers bore wounds of one sort or another: burn scars and the like, and even, here and there, prosthetic sections of limb. I realized that the dreadful attrition of the youth of Europe had continued since 1938, necessitating the call-up of those wounded already, and more of the young women.

Gibson took off his heavy boots and massaged his cramped feet with a rueful grin at me. Nebogipfel sipped from a glass of water, while the batman provided Gibson and me with a cup of traditional English breakfast tea — tea, there in the Palaeocene!

“You have made quite a little colony,” I said to Gibson.

“I suppose so. It’s just the drill, you know.” He put down his boots and sipped his tea. “Of course we’re a jumble of Services here — I expect you noticed.”

“No,” I said frankly.

“Well, most of the chaps are Army, of course.” He pointed to a slim young trooper who wore a khaki tag at the shoulders of his Tropical shirt. “But a few of us, like him and myself, are RAF.

“RAF?”

“Royal Air Force. The men in gray suits have finally worked out that we’re the best chaps to drive these great iron brutes, you see.” A trooper of the Army passed by, goggling at Nebogipfel, and Gibson favored him with an easy grin. “Of course we don’t mind giving these foot-sloggers a lift. Better than leaving you to do it yourselves, eh, Stubbins?”

The man Stubbins — slim, red-haired, with an open, friendly face — grinned back, almost shyly, but evidently pleased at Gibson’s attention: all this despite the fact that he must have been a good foot taller than the diminutive Gibson, and some years older. I recognized in Gibson’s relaxed manner something of the poise of the natural leader.

“We’ve been here a week already,” Gibson said to me. “Surprising we didn’t stumble on you earlier, I suppose.”

“We weren’t expecting visitors,” I said drily. “If we had been, I suppose I would have lit fires, or found some other way of signaling our presence.”

He favored me with a wink. “We have been occupied ourselves. We had the devil’s own work to do in the first day or two here. We have good kit, of course — the boffins made it pretty clear to us be fore we left that the climate of dear old England is pretty variable, if you take a long enough view of it — and so we’ve come prepared with an issue of everything from greatcoats to Bombay bloomers. But we weren’t expecting quite these Tropical conditions: not here, in the middle of London! Our clothes seem to be falling apart literally rotting off our backs — and the metal fittings are rusting, and our boots won’t grip in this slime: even my bally socks have shrunk! And the whole lot is being gnawed away by rats.” He frowned. “At least I think they are rats.”

“Probably not, in fact,” I remarked. “And the Juggernauts? Kitchener class, are they?”

Gibson cocked an eyebrow at me, evidently surprised at my display of this fragment of knowledge. “Actually we can barely move the ’Nauts: those wretched elephants’ feet sink into this endless mud…”

And now a clear, familiar voice called out from behind me: “I’m afraid you’re a little out of date, sir. The Kitchener class — including the dear old Raglan — has been obsolete for a number of years now…”

I turned in my chair. Approaching me was a figure dressed in a crisp Juggernaut crew beret and coverall; this soldier walked with a pronounced limp, and a hand was proffered for shaking. I took the hand; it was small but strong.

“Captain Hilary Bond,” I said, and smiled.

She looked me up and down, taking in my beard and animal-skin clothes. “You’re a little more ragged, sir, but quite unmistakable. Surprised to see me?”

“After a few doses of this time traveling, nothing much surprises me any more, Hilary!”

Gibson and Bond explained the purpose of the Chronic Expeditionary Force to me.

Thanks to the development of Carolinum fission piles, Britain and America had managed to achieve the production of Plattnerite in reasonable quantities soon after my escape into time. No longer did the engineers of the day have to rely on the scraps and leavings of my old workshop!

There was still a great fear that German chronic warriors were planning some sneak offensive against Britain’s past — and besides, it was known from the wreckage we had left behind in Imperial College, and other clues, that Nebogipfel and I must have traveled some tens of millions of years into the past. So a fleet of time-traveling Juggernauts was rapidly assembled, and equipped with subtle instruments which could detect the presence of Plattnerite traces (based on the radio-active origins of that substance, I was given to understand). And now this Expeditionary Force was proceeding into the past, in great leaps of five million years or more.

Its mission was nothing less than to secure the History of Britain from anachronistic attack!

When stops were made, a valiant effort was made to study the period; and to this end a number of the soldiers had been trained, albeit hastily, to act as amateur scientists: climatologists, ornithologists and the like. These fellows made rapid but effective surveys of the flora, fauna, climate and geology of the Age, and a good deal of Gibson’s daily log was given over to summarizing such observations. I saw that the soldiers, common men and women all, accepted this task with good humor and joking, as such people will, and — it seemed to me — they showed a healthy interest in the nature of the strange, Palaeocene Thames valley around them.

But at night sentries patrolled the perimeter of the encampment, and troopers with field-glasses spent a great deal of their time peering at the air, or the Sea. When engaged in these duties, the soldiers showed none of the gentle humor and curiosity which characterized their scientific or other endeavors; rather, their fear and intent was apparent in the set of their faces, and the thinness of their eyes.

This Force was here, after all, not to study flowers, but to seek Germans: time-traveling human enemies, here amid the wonders of the past.

Proud as I was of my achievements in surviving in this alien Age, it was with considerable relief that I abandoned my suit of rags and animal pelts and donned the light, comfortable Tropical kit of these time-traversing troopers. I shaved off my beard, washed — in warm, clean water, with soap! — and tucked with relish into meals of tinned soya-meat. And at night, it was with a feeling of peace and security that I lay down under a covering of canvas and mosquito netting, and with the powerful shoulders of the ’Nauts all about me.