‘What the bloody hell has that man got on his head?’ muttered Vespasian.

‘Antlers, sir.’

‘I can see they’re bloody antlers. But why has he got them on his head? Must be awkward.’

‘Yes, sir. Some kind of religious apparatus.’ Plinius shrank back from the glare his superior shot at him. ‘Probably…’

Just beyond the range of slingshot, the horseman yanked hard on the halter and those on the wall could clearly hear the sharp cry of pain from his prisoner. The rider climbed down from his horse and tossed the halter aside. The Roman sank to his knees. He was clearly exhausted, and his head slumped forward onto his breast. But his respite was momentary. The rider struck him on the head and pointed towards the fort. The men on the rampart could hear shouted words, but could make no sense of them. The Roman raised his head, steadied himself and cried out to those on the wall.

‘Hear me! … I have a message for the commander of this legion… Is he there?’

Vespasian cupped his hands and called back, ‘Speak! Who are you?’

‘Valerius Maxentius… prefect of the naval squadron at Gesoriacum.’

The men on the rampart gasped in surprise that so senior an officer was in the hands of the Druids, and anxious exchanges rippled out along the palisade.

‘Silence!’ Vespasian roared. ‘The next man to speak will be flogged! Centurion, make sure you get their names!’

‘Yes, sir.’

Beyond the wall, Maxentius was calling out to them again, his voice strained and thin, deadened by the snow lying on the ground. ‘I have been told to speak for the Druids of the Dark Moon… My ship was wrecked on the coast, and the survivors, a woman, her children and myself, were taken by a Durotrigan raiding party… They handed us over to the Druids. In exchange for the release of these prisoners, the Druids want some of their comrades returned to them. Five Druids of the first ring were taken by the general last summer… This man, the High Priest of the Dark Moon, is their leader. He gives you until the Feast of the First Budding — thirty days from now — to respond to his demand… If the Druids are not released by the time of the feast, he will burn his prisoners alive as a sacrifice to Cruach.’

Vespasian recalled the words of Centurion Albinus and shuddered. The thought of his own wife and son screaming amid crackling flames filled his mind’s eye and his fingers gripped the palisade tightly as he fought off the terrible image.

The rider leaned down, close to Maxentius’s head, and appeared to be saying something to him. Then he stepped back and parted his black cloak. Maxentius called out to them once more.