And that was how we got the villagers across the flooded valley, one by one, to the larger Conurbation - not that much was left of that by now - where the big transport waited to take us off. In the end we lost only one of the villagers, the young woman who had been overwhelmed by the surge. I tried to accept that I’d done my best to fulfil my contradictory mission objectives - and that, in the end, was the most important outcome for me.

As we lifted, Mount Perfect loosed another eruption.

Tilo, cocooned in a med cloak, stood beside me in an observation blister, watching the planet’s mindless fury. He said, ‘You know, you can’t stop a lahar. It just goes the way it wants to go. Like this war, it seems.’

‘I guess.’

‘We humans understand so little. We see so little. But when you add us together we combine into huge historical forces that none of us can deflect, any more than you can dam or divert a mighty lahar ...’

And so on. I made an excuse and left him there.

I went down to the sick bay, and watched Lian tending to the young from the village. I had relieved her of her regular duties, as she was one of the few faces on board that was familiar to the traumatised kids, so she was useful here. With the children now she was patient, competent, calm. I felt proud of that young marine; she had grown up a lot during our time on Shade.

And as I watched her simple humanity, I imagined a trillion such acts, linking past and future, history and destiny, a great tapestry of hard work and goodwill that united mankind into a mighty host that would some day rule a Galaxy.

To tell the truth I was bored with Tilo and his niggling. War! It was magnificent. It was inevitable. I didn’t understand what had happened down on Shade, and I didn’t care. What did it matter how the war had started, in truth or lies? We would soon forget about dark matter and the Xeelee’s obscure, immense projects, just as we had before; we humans didn’t think in such terms. All that mattered was that the war was here, at last.

The oddest thing was that none of it had anything to do with the Xeelee themselves. We needed a war. Any enemy would have served our purposes just as well.

I began to wonder what it would mean for me. I felt my heart beat faster, like a drumbeat.

We flew into a rising cloud of ash, and bits of rock clattered against our hull, frightening the children.