‘I want her to be good, and to be the kind of person others would like. But I told her I was sorry that I had been a poor mother, an absent mother. When she was very small she had a doll, a soldier. I carry it with me as a good-luck charm.’ She patted her dust-covered tunic. Luca saw a slight bulge there. ‘This way she is always with me. The last time I saw her was during my last leave on New Earth. She was with the other children. They lined up to wave flags and sing for us. It’s burned in my mind, her face that day. I told her that when she hears of my death she should be happy for me, for I will have achieved my ambition.’

‘You embrace death, but you dream of your family.’

Bayla glanced at him. ‘What else is there to do?’

Another piercing shriek in Luca’s comms unit. No, it was a word, he realised, a word yelled so loud it overwhelmed the system itself. In response there was a muffled roar - more voices, thousands of voices, shouting together, maybe every trooper on the Rock.

Bayla raised her hand again, watching lights flash on her sleeve. ‘Wait, wait.’ The cherry-red light in the sky was growing brighter, shading to pink. It was like a silent, gathering sunrise, as if the Rock was turning to face some vast source of heat, and the noise rose in response.

Bayla brought her arm chopping down.

The first row of troopers swarmed forward, struggling to get out of the trench. Red light flared. Most of them fell back immediately, broken, limp, gases venting from ruined suits, and the yelling was broken now by screams of pain. Without hesitation the second line pushed after the first. They trampled on the fallen bodies of their comrades, even those who still moved, pushing their way over flesh and dirt to get to the lip of the trench. But they fell back in their turn, as if their bodies were exploding. Yet another line of troopers gathered and began to rush over the lip of the trench.

Suddenly Luca felt swept up, as if a great tide of blood was lifting these yelling troopers into battle. Without conscious thought he tore at the dirt with clumsy hands and hoisted his body out of the trench.