At a distance of perhaps a mile from our lines the sergeant became visibly uneasy, but I was too puffed up with success to pay him any heed. We had crossed two streams which were, as indicated on the map, too shallow to provide any kind of cover, and I became inflamed with a vision of myself casually presenting the whole area to Kadal as a prize I had won on his behalf with my boldness.

Before I knew it we had advanced close on two miles and even in my fit of megalomania I was beginning to hear the nagging voice of common sense warning me that enough was enough, especially as we had crossed a vestigial ridge and were no longer in sight of our own lines.

That was when the Chamtethans made their appearance.

They sprang up from the ground on both sides as if by magic, though of course there was no sorcery involved — they had been hiding in the very gullies whose existence I had blithely set out to disprove. There were at least two-hundred, looking like black reptiles in their brakka armour. Had their force been composed solely of infantry we could have outrun them, but a good quarter of their number were mounted and were already racing to block off our retreat.

I became aware of my men staring at me expectantly, and the fact that there was no sign of reproach in their eyes made my personal position all the worse. I had thrown away their lives with my overweening pride and stupidity, and all they asked of me in that terrible moment was a decision as to where and how they should die!

I looked all about and saw a tree-covered mound several furlongs ahead of us. It would afford some protection and there was a possibility that from high up in one of the trees we would be able to get a sunwriter message back to Kadal and call for help.

I gave the necessary order and we rode with all speed to the mound, fortuitously surprising the Chamtethans, who had expected us to flee in the opposite direction. We reached the trees well ahead of our pursuers, who in any case were in no particular hurry. Time was on their side, and it was all too clear to me that even if we did succeed in communicating with Kadal it would be to no avail.

While one of the men was beginning to climb a tree with the sunwriter slung on his belt I used my field glasses in an attempt to locate the Chamtethan commander, to see if I could divine his intention. If he was cognisant of my rank he might try to take me alive — and that was something I could not have permitted. It was while sweeping the line of Chamtethan soldiers with the powerful glasses that I saw something which, even at that time of high peril, produced in me a spasm of dread.

Ptertha!

Four of the purple-tinted globes were approaching from the south, borne on the light breeze, skimming over the grass. They were plainly visible to the enemy — I saw several men point at them — but to my surprise no defensive action was taken. I saw the globes come closer and closer to the Chamtethans and — such is the power of reflex — J had to stifle the urge to shout a warning. The foremost of the globes reached the line of soldiers and abruptly ceased to exist, having burst among them.

Still no defensive or evasive action was taken. I even saw one soldier casually slash at a ptertha with his sword. In a matter of seconds the four globes had disintegrated, shedding their charges of deadly dust among the enemy, who appeared to be quite uncaring.

If what had happened up to that point was surprising, the aftermath was even more so.

The Chamtethans were in the process of spreading out to form a circle around our inadequate little fortress when I saw the beginnings of a commotion among their ranks. My glasses showed that some of the black-armoured soldiers had fallen. Already! Their comrades were kneeling beside them to render aid and — within the space of several breaths — they too were sprawling and writhing on the ground!

The sergeant came to my side and said, “Sir, the corporal says he can see our lines. What message do you want to send?”

“Wait!” I elevated my glasses slightly to take in the middle distance and after a moment picked out other ptertha weaving and wavering above the grasslands. “Instruct him to inform Captain Kadal that we have encountered a large detachment of the enemy, but that he is to remain where he is. He is not to advance until I send a further command.”

The sergeant was too well disciplined to venture a protest, but his perplexity was evident as he hurried away to transmit my orders. I resumed my surveillance of the Chamtethans. By that time there was a general awareness that something was terribly amiss, evidenced by the manner in which the soldiers were running here and there in panic and confusion. Men who had begun to advance on our position turned and — not understanding that their sole hope of survival lay in fleeing the scene — rejoined the main body of their force. I watched with a clammy coldness in my gut as they too began to stagger and fall.

There were gasps of wonderment from behind me as my own men, even with unaided vision, took in the fact that the Chamtethans were swiftly being destroyed by some awesome and invisible agency. In a frighteningly short space of time every last one of the enemy had gone down, and nothing was moving on the plain save groups ofbluehorns which had begun to graze unconcernedly among the bodies of their masters. (Why is it that all members of the animal kingdom, apart from types of simian, are immune to ptertha poison?)

When 1 had taken my fill of the dread scene I turned and almost laughed aloud as I saw that my men were gazing at me with a mixture of relief, respect and adoration. They had believed themselves doomed, and now — such are the workings of the common soldier’s mind — their gratitude for being spared was being focussed on me, as though their deliverance had been won through some masterly strategy on my part. They seemed to have no thought at all for the wider implications of what had occurred.

Three years earlier Kolcorron had been brought to its knees by a sudden malevolent change in the nature of our age-old foe, the ptertha, and now it appeared that there had been another and greater escalation of the globes’ evil powers. The new form of pterthacosis — for nothing else could have struck down the Chamtethans — which killed a man in seconds instead of hours was a grim portent of dark days ahead of us.

I relayed a message to Kadal, warning him to keep within the forest and to be on the alert for ptertha, then returned to my vigil. The glasses showed some ptertha in groups of two or three drifting on the southerly breeze. We were reasonably safe from them, thanks to the protection of the trees, but I waited for some time and made sure the sky was absolutely clear before giving the order to retrieve our bluehorns and to return to our own lines at maximum speed. DAY 109. It transpires that I was quite wrong about a new and intensified threat from the ptertha.

Leddravohr has arrived at the truth by a characteristically direct method. He had a group of Chamtethan men and women tied to stakes on a patch of open ground, and beside them he placed a group of our own wounded, men who had little hope of recovery. Eventually they were found by drifting ptertha, and the outcome was witnessed through telescopes. The Kolcorronians, in spite of their weakened condition, took two hours to succumb to pterthacosis — but the hapless Chamtethans died almost immediately.

Why does this strange anomaly exist?

One theory I have heard is that the Chamtethans as a race have a certain inherited weakness which renders them highly vulnerable to pterthacosis, but I believe that the real explanation is the much more complicated one advanced by our medical advisors. It depends on there being two distinct varieties of ptertha — the blackish-purple type known of old to Kolcorron, which is highly venomous; and a pink type indigenous to Chamteth, which is harmless or relatively so. (The sighting of a pink globe in this area turns out to have been duplicated many times elsewhere.)