As the distance closed between the two sides, the Druids barked out orders to the Durotrigan warriors. With a crack of reins and cries of instruction and encouragement to their horses, the charioteers on the flanks began to move further out, ready to charge down on any gaps that opened in the Roman formation. Axles squeaked and the heavy wheels rumbled as the chariots moved off under the anxious gaze of the legionaries. Cato tried to reassure himself that they had little to fear from these outdated weapons. As long as the Roman lines held firm, the chariots could be regarded as little more than an unpleasant distraction.

As long as the formation held firm.

‘Hold the line steady!’ Macro shouted, as some of the more nervous men in the century began to outpace their comrades. Chastened, the men adjusted their stride and lines evened out to present an unbroken wall of shields to the enemy. The Durotriges were no more than a hundred paces away now and Cato could pick out the individual features of the men he would kill or be killed by in the next few moments. Most of the enemy’s heavy infantry wore chain mail over their brightly coloured tunics and leggings. Shaggy beards and pigtails hung down beneath polished helmets and each man carried a war spear or long sword. Although they had been organised into a discreet unit, it was clear from the unevenness of their line of shields that they had been poorly trained in formation drill.

Cato was aware of a strange whirring sound rising above the crunch of snow and chink of equipment, and glanced to the light infantry on each side of the enemy centre.

‘Slingers!’ someone shouted out from the Roman ranks.

Centurion Hortensius reacted at once. ‘First two ranks! Shields high and low!’

Cato adjusted his grip and crouched slightly so that the bottom rim of his shield protected his shins. The legionary immediately behind raised his shield above Cato. The action was repeated all along the first two ranks so that the front of the Roman formation was sheltered from the coming volley. A moment later and the whirring abruptly rose in pitch and was accompanied by a whipping sound. A deafening rattle filled the air as the deadly volley of shot struck the Roman shields. Cato flinched as a corner of his shield was hit by a lead shot. But the Roman line did not falter and remorselessly advanced as the slingshot continued to crash off the shields with a sound like a thousand hammer blows. Yet several cries told of shots that had found their targets. Those men who fell out of line were quickly replaced by the legionaries in the next rank and their writhing forms left to be scooped up by a handful of men acting as casualty bearers and dumped in one of the cohort’s wagons, rumbling along inside the square.