He reached the infantry even as the other groups managed to close and link up, wheeling into a bladed wheel formation that no horse – no matter how well trained – would challenge.

Within the ring, a swordsman began beating sword on shield, bellowing to add his voice to the rhythm of blows. The wheel spun, each soldier stepping in time, spun, crossing the ground, spun, slowly returning to where the remaining company still held the line on this, the west flank of the Chain.

Duiker moved with them, part of the outer ring, delivering killing blows to whatever wounded enemy soldier the wheel trampled. Five Crow riders kept pace. They were the last survivors of the counterattack and, of those, two would not fight again.

A few moments later the wheel reached the line, broke apart and melted into it. The Wickans dug spurs into their lathered horses to race southward. Duiker pushed his way through the ranks until he stumbled into the clear. He lowered his quivering arms, spat blood onto the ground, then slowly raised his head.

The mass of refugees marched before him, a procession grinding past the spot where he stood. Wreathed in dust, hundreds of faces were turned in his direction, watching that thin cordon of infantry behind him – all that lay between them and slaughter – as it surged, buckled and grew ever thinner with each minute that passed. The faces were expressionless, driven to a place beyond thought and beyond emotion. They were part of a tidal flow where no ebb was possible, where to drop back too far was fatal, and so they stumbled on, clutching the last and most precious of their possessions: their children.

Two figures approached Duiker, coming down alongside the stream of refugees from the vanguard position. The historian stared at them blankly, sensing that he should recognize the two – but every face had become a stranger’s face.

‘Historian!’

The voice jarred him out of his fugue. His split lip stung as he said, ‘Captain Lull.’

A webbed jug was thrust at him. Duiker forced his short sword back into its scabbard and accepted the jug. The cool water filled his mouth with pain but he ignored it, drinking deep.

‘We’ve reached Geleen Plain,’ Lull said.

The other person was Duiker’s nameless marine. She wavered where she stood, and the historian saw a vicious puncture wound in her left shoulder, where a lance-point had slipped over her shield. Broken rings from her armour glittered in the gaping hole.

Their eyes met. Duiker saw nothing still alive in those once beautiful light-grey eyes, yet the alarm he felt within him came not from what he saw, but from his own lack of shock, the frightening absence of all feeling – even dismay.

‘Coltaine wants you,’ Lull said.

‘He’s still breathing, is he?’

‘Aye.’

‘I imagine he wants this.’ Duiker pulled free the small glass bottle on its silver chain. ‘Here—’