bunch up. The centurions in the following units slowed the pace and the cohort floundered on, water rising steadily until it was halfway up their chests. Vitellius saw that they were approaching the far bank, fifty paces away, and beyond that the looming mass of the British earthworks guarding the ford.
Suddenly there was a sharp cry ahead, then a few more, as the front rank encountered the first series of underwater obstacles - several lines of sharpened stakes driven into the river bed.
‘Break ranks!’ shouted the chief centurion at the top of his voice. ‘Break ranks and watch out for them fucking spikes! When you’ve got, em, pull ‘ em up and move on!’
The advance faltered and then halted as the men of the First Cohort felt their way through the water, pausing to heave the stakes up, two and three men at a time. Gradually a path was cleared through to the far bank, and the advance continued past the handful of injured men being helped to the rear. The First Century had already climbed out of the river and was dressing its ranks on the muddy bank when the following units passed through the gap in the stakes.
Geta turned back to Vitellius with a wry smile. ‘I’m afraid things are about to get hot, so keep that shield up!’
The triremes stopped firing and the noise of bolts and rocks flying through the air ceased. The flat trajectory was now too close to the heads of the infantry to continue. As soon as the barrage stopped, there was a great roar and braying of war horns from the Britons behind the earthworks. All along the palisade the enemy rose up and prepared to meet their attackers. A strange whirring sound filled the air, and before the Romans could react, the first volley of slingshot slashed into the foremost ranks of the cohort, knocking men to the ground as the vicious mixture of lead shot and stones cracked into their targets. Vitellius raised his shield just as a shot struck the boss, the numbing impact jolting every bone and nerve as far as his elbow. Glancing about he saw that the First Cohort had gone to ground, covering themselves as best they could against the fusillade. But the curved line of the fortifications meant that fire was coming in on three sides and continued to whittle down the attackers. At the same time the Second Cohort was emerging from the river. Unless something was done immediately, the attack would crumble into a heaving mass that would provide the British slingers with the best possible target.
Geta was squatting beside Vitellius in the middle of the colour party.
He checked the strap on his helmet, held his shield close and rose to his feet.
‘First Cohort! Form testudo by centuries!’
The order was relayed at top parade-ground volume by the chief centurion and the men of each century were bullied back onto their feet by their centurions. The men realised that the testudo was their best chance of surviving the assault, and they quickly formed the wall and roof of protecting shields. The colour party sheltered behind the shields of Geta’s bodyguards and watched the testudo tramp towards the earth works, under constant, but largely ineffective, fire. As the following cohorts mounted the bank, the same order was given, and each formation was ordered to make for a different section of the defences. The muddy ground between the river and the fortifications was littered with dead and injured. Those who could kept themselves covered with their shields against the British missiles whirling through the air. Vitellius was filled with a sickly sense of fear and excitement as the First Cohort reached the outer ditch and, struggling to retain their formation, slowly rippled over its edge.
When the testudo reached the slope up to the palisade a sharp order was given. The formation dissolved and each man scrambled up the earthworks towards the British warriors screaming war cries beneath their flowing serpent standards. With the steep incline against them and laden down with