As soon as the rearguard came alongside him, Cato bellowed the order to fall back and the compact group of Romans and Atrebatans inched towards the entrance to the redoubt, all the while thrusting shields and swords into the faces of their enemies. The Durotrigans could scent victory now, and were desperate to obliterate the last of the defenders. So they closed on Cato and his men with a savage ferocity that knew no bounds, slashing, thrusting, kicking and even head-butting the shields of the defenders in their desperation to destroy. The last of the legionaries disappeared inside the redoubt and now Cato’s men were falling back through the gap, until there was only Cato, Mandrax and a handful of others.

‘Get the standard inside!’

Mandrax made a wild slash at the man facing him, who shrank back from the feint, and then the standard was gone, leaving Cato and one other man, facing the endless ranks of woad-painted faces beneath limed hair. Behind them, Macro appeared at the breastwork.

‘Cato! Run, lad!’

As the young centurion thrust his shield forward he yelled at the man beside him to fall back. The native warrior, crazed by battle beyond all reason, did not heed the order and slashed at the nearest enemy, shattering the top of his foe’s skull. The warrior’s cry of triumph barely rasped from his throat before a spearthrust caught him in the mouth and passed right through his head, emerging in a bloody tangle of blood, bone and hair at the back of his head, and knocking his helmet off. Cato ducked behind the body as it slumped down, and ran through the gap.

‘Close it up!’ Macro shouted, and the men waiting behind the wagon heaved it forward. The axles groaned as the solid wheels rumbled towards the sturdy stone wall of the great hall. One of the Durotrigans made it into the gap and faltered as he sensed the wagon. He turned and was caught and crushed on the tailboard as the wagon crashed up against the masonry and the gap was sealed. As soon as the vehicle was stationary, wicker baskets packed with earth were heaved under the axles to stop the enemy trying to move the wagon or sneak underneath it.

Although most of the legionaries and the native warriors had gained the shelter of the redoubt the fight was far from over. The Durotrigans swarmed up to the breastworks, thrusting their spears and the points of their swords at the men above them. Macro had handpicked the defenders and, protected by the crude fortifications and their large shields, the legionaries kept the enemy at bay. Some of the Durotrigans tried to clamber up the sides of the wagons, but were quickly dealt with and, dead or dying, tumbled back down on to their comrades.