Vespasian showed no sign of unease. Indeed the legate seemed rather to be enjoying the spectacle. Vespasian pointed east, back the way they had come. ‘You can see the native track we’ve been following,’ he said.

The track had run parallel to the south bank of the estuary of the Tamesis, following a roughly straight line - not paved or properly constructed like a Roman road, but obviously ancient, heavily rutted and clearly useful. The army had made a thorough mess of its surface, leaving a band of churned earth that stretched off into the afternoon mist. But somewhere back there teams of road-builders laboured; the next force that came this way would make much faster progress.

‘But,’ Narcissus said, ‘the track has led us to this fording place across the river.’

‘Quite,’ Vespasian said. ‘The scouts say that the river here is an eighth of a mile wide. Not far downstream it widens - look, you can see - to perhaps twice that width. Further upstream it deepens quickly. So this ford is by far the easiest place to cross, and the British know it. This is the first significant obstacle we’ve faced since Rutupiae, the first pinch point where our formation is constrained. And so this is where the Britons have gathered to greet us. No doubt they intend to slaughter us one by one as we struggle across the ford.’

‘But,’ Narcissus said, ‘the Britons know the land as we do not. Why make a stand at all? They could hide, harry us, try to starve us out.’

Narcissus shrugged. ‘They’ve made some rather half-hearted attempts to do just that. But there doesn’t seem a great deal of competence over there, secretary. We suspected as much from the moment we landed unopposed.’

‘Unopposed save for a foolish boy who thought we were his friends,’ Narcissus said, a little wistfully. ‘Well, I imagine you have no intention of falling into the rather pathetic trap the Britons have set for you. What, then?’

Vespasian eyed him, almost mischievously. ‘But that would spoil the fun! Do you really want to know how the plot will unfold even before the actors take the stage?’

Narcissus grumpily turned his horse’s head, and led the way down towards the lower ground. ‘Suit yourself. In the meantime I’m going to spend the rest of the day with Phoebus.’ This was the most senior of the surgeons Aulus Plautius had brought with him - and, like most of the army’s best doctors, he was Greek, like Narcissus. ‘While you crack barbarian skulls, I may get some civilised conversation for a change. And perhaps I’ll help stitch a few wounds or bathe a few broken heads. For I’m quite sure that for all your complacency, Vespasian, the Britons’ iron blades will do some damage before this is over.’