The retreat had stopped and while the men in the front rank fought off the enemy, those behind, still carrying their javelins, quickly opened their ranks and swung back their throwing arms.

‘Remember, aim long! Javelins, loose!’

This time the thin spread of dark shafts arced up high, gleaming as they reached the top of their trajectory, then dipped down sharply to plunge into the tight mass of men around Caratacus and his chariot. Cato was watching this final volley with an intense stare and saw a javelin strike through Caratacus’ shoulder, carrying the enemy commander down on to the bed of his chariot and out of sight. Above the cries of the injured a deep groan sounded from the throats of the British warriors as they realised that their leader had been struck. The column wavered as those at the front turned to see what had happened, then they began to ebb back towards the chariot, disengaging from the Romans. Cato saw his chance and took it.

‘Fall back! Fall back!’

The remnants of the Sixth Century started to march away from the enemy, the rearmost men keeping a close watch behind them as they made best speed towards the safety of the distant cohort. Cato led them round the final corner and ahead of them the track led straight towards the hastily erected fortifications, no more than two hundred paces away. The temptation to run for it was overwhelming but Cato knew that he and his men must retire in good order.

‘Don’t run, lads! Keep in formation!’

Behind them, there was a shout, an order, and Cato recognised the voice of Caratacus, bellowing at his men to renew the assault. They took up his cry with a roar.

Cato glanced at his optio. ‘That didn’t last long.’

‘No, sir,’ Septimus smiled ruefully. ‘Not much gets between your average Celt and the prospect of a good fight.’

Ahead of them, Cato could see figures rushing to man the rampart that stretched across the track and a short distance into the marsh on either side, ending in a small redoubt on each flank. A hundred and fifty paces to go, and there was a glimmer of light from the gate as it was heaved open. Cato glanced back and saw the first of the enemy warriors burst round the bend, weapons raised and mouths gaping as they screamed out their war cries. With a pounding of hoofs and a rumble of wheels, Caratacus’ chariot lurched round the corner. The enemy commander stood over the axle, one hand clasped to his injured shoulder, the other jabbing his war spear towards the enemy. Cato could only admire his ruthless sense of purpose that spared him no agony.