‘How long? All day?’

‘If necessary, and all night, and another day. This is our country, remember. Let them sit here and starve.’

Cunedda said, ‘But this waiting is hard. Even I long to start swinging my sword.’

Nectovelin grimaced. ‘That’s the British way. You draw up your army to face the other fellow’s horde. After a lot of screaming and insulting and arse-showing, you might have a minor punch-up. Sometimes you’ll just send in a champion or two to fight on behalf of the rest. Then, when honour is satisfied, you go home to your farm.’

‘But that’s not the Roman way.’

‘Oh, no. The Romans believe in finishing what they start.’

‘Can we win today, Nectovelin?’

‘Of course we can. There are more of us than them, aren’t there? And they are a long way from home. But it’s out of our hands, Cunedda. It’s up to the princes. I don’t doubt their courage. Let’s see if either of them has half the wisdom of their father.’

So the two forces faced each other, the disciplined Roman cohorts eerily calm and silent, the braying British mob facing them. As the heat gathered and the last of the morning mist burned off, Cunedda grew hot, thirsty, weary from standing, irritable from the discomfort of his heavy armour. He longed for this to be over one way or another - he longed for something to happen, anything - and it seemed to him that the tension was gathering to breaking point.

At last one man rushed forward from the British line, eyes bulging, waving a gleaming sword and howling. Cunedda had no idea who he was or why he had done this, but it was enough to break the stalemate. In a moment the noise rose to a clamorous roar, so loud Cunedda could barely think, and all around him powerful bodies surged forward with a clatter of swords on spears. Cunedda hesitated, but a shove in the back propelled him forward after the rest.

The whole of the British line hurled itself forward at once, with not a command being given.

Cunedda was swept towards the nearest patch of high ground, and the Roman cohort stationed there. But the Romans stood firm. The legionaries in the front line held their half-cylinder shields lodged in the ground so they made a fence, from behind which spears protruded, metal tips on wooden shafts. They were so still it was as if Cunedda was being pushed towards a stone wall.

And before he reached the shields, to a thin trumpet blast, Roman javelins were raised and hurled into the air.