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.

Under a sky black with a thousand javelins the advancing British stalled. Those in the lead scrambled back and raised their shields, but those charging from behind piled into those ahead, and the mass of warriors closed up into a struggling crowd. Now Cunedda was trapped in a compressed mass, wedged so tightly he could barely breathe, and his feet were swept off the ground. He was overwhelmed by the suddenness of all this after the hours of stasis.

Then the first javelins fell. Not a pace away from Cunedda one stitched a man to the ground, where he floundered, screaming, a frothy pink fluid bubbling out of his splayed rib cage. More javelins came down, piercing heads and limbs and torsos. Battle cries were now laced with screams of pain, and the mood of the mass turned from rage and frustration to panic. But there was nowhere to go, no way to flee, or even to advance. And still the javelins fell.

With a mighty effort Cunedda managed to get his own shield raised over his head-and just as he did so a point of hardened metal pushed through splintering wood, stopping not a fraction from his right eye. He lived, he breathed. But the embedded javelin made his shield impossibly unwieldy. The javelin had bent, he found. The shaft was attached to the tip by some soft metal, and the javelin was hard even to get hold of, let alone to pull out of his shield.

As Cunedda struggled, he saw he wasn't alone. Suddenly the ground was covered by a kind of hedge of smashed shields and protruding javelins, so entangling it was impossible to move in any direction. The javelins were meant to bend, he saw, even if they didn't succeed in killing. He felt awed by the cunning. Cunedda had been part of a disorganised mob since the charge had begun; now that mob was tripping, falling, those who could still move fighting with each other for space and air.

There was a steady drumming, and Cunedda looked ahead. The Romans were at last advancing. The blank shield wall of the front rank of troops had broken into wedge formations, which were now pushing down the hill. The Romans carried short, heavy-looking swords with massive hilts that they drummed against their shields as they advanced. And in the last moment the Romans ran.

When they closed, their shields thudding into British bodies, the crowd of Britons reeled back as if suffering a massive punch. From behind their shields the Romans stabbed at the faces of their enemies and clubbed at heads and necks. The blows landed with wet, meaty sounds. Cunedda saw a face split open from brow to upper teeth, a belly slashed so that grey guts poured out onto the ground, another man whose lower jaw was all but severed and left gaping almost comically from a sliver of gristle, but he fought on. Horrors, every way he looked. And everywhere blood spurted, impossibly crimson.

The screaming became focused now, as the men of the British front rank, trapped between the Roman shields and their fellows, began to die in a mass, and the air filled with the stink of shit and piss and blood.

Cunedda had had no idea it would be like this. Numbed, he tried to move forward. He dropped his speared shield, though he knew it left him vulnerable. But he was still so jammed in he couldn't even raise his arms.

And the Romans worked on. Cunedda could clearly see how they were leaning into their shields, pushing the British back even as they thrust with their short swords. For armoured men they moved with remarkable flexibility, bending and twisting as they did their grisly work of slicing into the mass of British flesh ahead of them. Their armour was not mail or solid plate but an arrangement of overlapping steel strips, somehow linked together so the soldiers could bend easily. The legionaries did their work efficiently, without humour or joy or even much interest.

Soon the lead Romans had pushed so far into the crowd they were no more than paces away from Cunedda, and still the grinding slaughter continued. It was going to be a squalid death, Cunedda thought, like an animal trapped in a pen before a slaughterman's knife. The waste of it overwhelmed him, a feeling stronger even than fear. But if he must die he would strike at least one blow first. He struggled to keep his feet on ground becoming slick with blood, and he tried again to raise his sword.

Something hard and heavy smashed into the back of his head. A massive hand grasped his neck and pulled him backward. His vision swam with blood, and he knew no more.

Somehow Nectovelin had dragged Cunedda out of the thick of the fighting. He brought him to the cover of a scrap of wood, on a patch of high ground unoccupied by the Romans.

Nectovelin, his own face a mask of blood, loomed over him. 'I don't want to hear a word about how you have been dishonoured by not being allowed to die. You're smart enough to know that there's no honour in a pointless death. And it would have been pointless, wouldn't it?'

Cunedda struggled to sit up. They were in the shade of the trees, in cool green. His head banged with pain; Nectovelin said a warrior on his own side had managed to clatter him with a club. He was drenched with blood, but little of it was his own.

The roaring of the battle continued, and the air stank of shit and death. He scrambled to the edge of the copse and peered out.

From this bit of high ground he could see the disposition of the Roman army. The Roman units were still hard, compact blocks, red and black and silver. There were ten of them, with four in a front row engaged with the British and two rows of three waiting in reserve behind. Further away was another set of ten cohorts with a similar deployment. Away from the stolid blocks of the legionary cohorts were smaller units, on foot or horseback. They were auxiliaries, he knew, cavalry or specialists such as archers and slingers. They held their positions, not needed yet.

By comparison the shapeless British mob looked like a tide that had swept forward. And wherever British wave crashed against sturdy Roman block there was a bright froth of blood.

Nectovelin, beside him, pointed. 'Look over there.'

Marching from the west, Cunedda made out more compact Roman units, tramping steadily towards the fray.

'I've been counting the cohorts,' Nectovelin said grimly. 'I reckon we face three Roman legions today. Ten cohorts each, see? We've already broken ourselves on two of them. And now here comes the third, to mop us up.'

'How long was I out?'

Nectovelin shrugged. 'Heartbeats. Not long.'

Cunedda glanced up and saw that the sun hadn't moved perceptibly from where it had been when the charge had begun. 'And yet the battle is already lost.'

'Oh, there's plenty of killing to be done. But, yes. In fact we lost it the moment we charged. Look.' He pointed to the rear of the British lines, where the non-combatants, the wives and children and traders, were hastily packing up and fleeing. 'The Roman cavalry will come after them, but the women and children ought to get away. Agrippina has a chance.' He laughed darkly. 'Never did think much of Roman cavalry.'

'What of the princes?'

'Who can say?'

'Nectovelin, in the thick of the fighting-the way the Romans killed-it was relentless.'