Cato nodded his satisfaction then turned back to assess his situation. The horsemen were preparing to charge again; tightening the grip on their reins and weapons. As soon as the first man urged his mount forward Cato shouted an order to ready javelins. The horsemen faltered at the sight of the dark, deadly shafts being prepared for them, and then reined in and drew up, still out of range.

‘Good,’ Cato muttered. ‘Port javelins! Sixth Century will prepare to retire . . . march!’

The legionaries started to retreat in good order, keeping their faces to the enemy, as they stepped back carefully to avoid any stumbling. The horsemen stared at the Romans for a moment and then a chorus of jeers and catcalls pursued the legionaries up the track. One of Cato’s men started to shout some abuse back.

‘Silence!’ Cato shouted.’Ignore them. We’ve got nothing to prove. It’s not our men who are lying dead on the track!’

The five sections under Cato’s command steadily withdrew towards Septimus and his men. Even so, the gap between the Romans and the head of Caratacus’ column had narrowed considerably by the time Cato passed through the gap Septimus had left for him.

‘My turn to fall back,’ said Cato. ‘Their infantry might well be on you before you reach us.’

‘Looks that way, sir.’ Septimus nodded. ‘Don’t get too far ahead of us.’

‘I won’t. Good luck.’

‘Fuck that,’ muttered Septimus.’We’re going to need bloody divine intervention to see us through this lot.’

‘You’re not wrong,’ Cato smiled. ‘Stick it to them, Optio.’

Septimus saluted and turned away to make sure that his thin line was tightly closed up and ready to resist the coming onslaught. Cato led his men further up the track and as they reached a bend he halted and formed them up. In the distance, above the low-lying expanse of rushes and stunted trees and clumps of gorse he could see the distant figures of the rest of the cohort toiling away at the contruction of the rampart and palisade.

‘Not so far to go, lads!’

‘Far enough,’ someone muttered.

Cato spun round. ‘Silence there!’

He turned back to see how the optio was faring. Septimus was already on the move and the rearmost rank trudged slowly backwards. Only a short distance beyond them the horsemen had edged off the track and the main column of enemy infantry was marching swiftly forward, eager to close with the hated Romans and cut them to pieces.