‘Listen, you fucking savage, I’ve had enough of your game. You want to play rough with your prisoners? Then so can we. If your Druid puts that knife to the tribune again then I swear to all the gods that you will regret it for what’s left of your miserable bloody life.’

Caratacus laughed. ‘Don’t waste your breath on empty threats! Besides, my army would be most disappointed if I put an end to this spectacle. I have promised the tribune to the Druids to make a blood offering to our gods. Nothing can save him now!’

Macro heard sounds on the ladder behind him and saw Maridius being bundled up the ladder. He crossed to him and hauled him up on to the platform before dragging him across to the wooden rail. Clenching his fist in the long hair of the prisoner, Macro jerked his head up so that his face would be clearly visible to Caratacus and the others.

‘Do you recognise your brother, Caratacus?’ Macro shouted down the slope. ‘If you do any more harm to Tribune Mancinus, then I’ll match you cut for cut.’ He drew his dagger from its scabbard and held it up for the enemy commander to see.

There was a tense stillness before Caratacus responded. ‘You wouldn’t dare. He is too valuable a hostage to Rome.’

‘We are not in Rome!’ Macro called back. ‘We are in the arse end of the world. There is you, me and the two men we hold prisoner. If you harm the tribune, then I will harm Maridius. That is what will happen. Understand?’

Caratacus did not reply for a moment as he stared up at his younger brother and the Roman officer standing at his side. Then he spoke again. ‘If you harm my brother, then I swear that you, and any of your men I take alive when the fort falls will be subject to every cruelty, every torture, every humiliation before you are allowed to die. And I will do the same for every Roman prisoner that my army takes until we have driven you Roman scum from our lands. This I swear!’

Macro ignored the threat and kept his silence. Behind him, Centurion Petillius muttered, ‘He means it.’

‘So do I.’

The Druid turned to Caratacus and there was a brief exchange before the Druid raised his voice and turned back to the prisoner and cut him again, this time opening up his cheek with a swift slash of the blade. Macro did not hesistate. He turned to Maridius and stabbed him in the jaw. Blood splattered down on to the floorboards of the tower. Maridius let out a deep bellow of pain.

‘Hold him still!’ Macro commanded.

Petillius and the two sentries closed round the prisoner and grasped his shoulders as vivid red blood coursed down his neck and into the hairs on his chest.