As he marched beside his men Cato tried to put himself in Macro's position and as he quickly weighed up the options he realised that he would have accepted the need to stay and fight it out. The stakes were too great to do anything else. He turned to his men.
'Keep moving! Keep moving, damn you!'
Some of the legionaries in the Sixth Century exchanged surprised looks at this needless outburst and a bitter voice called out, 'We're going as fast as we fucking well can!'
Figulus jumped to one side of the column and turned on the men. 'Shut your mouths! I'll personally take the head off the next bastard to breathe a word! Save it for the Celts.'
Cato turned his eyes back to the enemy. The far bank was almost covered with men and horses now. They must be close to the ford. Ahead, the river curved away from him and appeared to narrow abruptly. Then, as the gleaming river seemed to cut into the north bank, Cato realised that he was seeing the island that lay in the middle of the ford. His pulse quickened as he squinted his eyes to catch the distant details. The far side of the island was a mass of tiny figures. Sunlight flashed off polished equipment and the spray in the water at the men's feet. The trees on the small island hid Macro's legionaries from view and there was no telling how the defenders fared.
As Cato watched, the enemy in the ford began to pull back, scurrying antlike towards their comrades massing on the far bank. His spirits rose as he knew that Macro and his men had repulsed the attack and still lived. Only half a mile now separated the cohort from Macro's century, and from the front of the column Maximius could be heard bellowing at his men, urging them on with every vile imprecation available to him.
The width of the river was in full view and Cato could see the enemy forming up for another assault on the island defences. But this time there was something altogether more organised about the attempt to force the crossing. Instead of the shapeless mob rushing towards the Roman lines, Cato saw a dense mass moving across the ford at a steady pace. By the time the enemy reached the far side of the island the cohort was no more than a few hundred yards from the entrance to the ford and Maximius sent the mounted scouts ahead to reinforce Centurion Macro.
They urged their horses on and pounded into the shallows with a great shower of white, sparkling spray. But before they were a third of the way across a legionary burst into sight from between the willows that lined the banks of the island. More men appeared, thrashing through the water. As they caught sight of the scouts they paused a moment, then continued fleeing towards the south bank. This was no rout, Cato realised as he saw that every man still carried his cumbersome shield and bronze and iron helmet. The scouts paused midstream and Cato could see the decurion angrily addressing the legionaries and stabbing his hand towards the island. They ignored him, filing between the flanks of the horses before rushing back towards the near bank. From the island a small tight knot of men emerged and plunged down into the crossing, keeping their shields towards the enemy. A short distance behind them, a handful of Britons followed the Romans into the ford, then more and more joined them, surging after the tiny rearguard covering the retreat of their comrades.
Maximius threw his arm forward along the track and shouted the order to advance. The sweating and panting legionaries broke into a run behind him, boots thudding down on the baked earth. Ahead, Macro's rearguard and the scouts fought a desperate withdrawal back across the ford, pursued all the way by growing numbers of the enemy. The men who had already reached the near bank were forming up, two deep, across the entrance to the ford. Even so, that thin scarlet line would not hold the bloodthirsty flood of Britons back for more than a brief moment.
The men of the cohort streamed along the track towards their comrades and soon the fittest and fastest of them began to join the Third Century, bolstering their small formation. Cato was close enough to the ford to make out more details of the unequal struggle being fought out midstream, and his heart rose at the sight of the transverse red crest of a centurion's helmet bobbing about above the heaving figures locked in bloody conflict. Macro still lived then. Even in the face of almost certain annihilation that thought was of some comfort to Cato as he charged down the last slope towards the legionaries hastily being thrust into position at the edge of the ford. Massively outnumbered as they were, they still enjoyed the tactical advantage of occupying a position that could only be assaulted on a narrow front. There was some hope, Cato told himself. Some hope that they might hold Caratacus back.
'Sixth Century!' Cato called out. 'Form up to the right of the line!'
His shattered men shuffled into place at the end of the cohort and could barely stand, coughing and gasping for breath as they leaned on their grounded shields. There was not much fight left in them, and wouldn't be until they recovered from the forced march under a blistering sun. But the enemy was almost upon them and in a moment they would be fighting for their lives.
The survivors of Macro's rearguard and the squadron of scouts fought their way back into the shallows, shields locked together as they thrust their short swords at any enemy body or limb that tried to force a gap through the Roman line. Maximius turned to men waiting on the river bank.
'Fourth Century! Give way!'
A gap opened up in the cohort behind Macro to allow him passage into the line and he bellowed an order to the decurion. 'Scouts first! Go!'
The mounted men disengaged and urged their horses towards the narrow gap. One rider was too slow, and as his horse struggled round a figure leaped up, grabbed him by the arm and wrenched him to the side. Attacker and scout crashed down into the water together and in an instant the enemy warriors closed round the scout with cries of triumph. A gurgling scream rent the air, then it was cut short as spears and swords thrust into the man's chest, driving the air from his lungs under the crushing impact of so many weapons. The brief distraction allowed Macro and his men to pull back safely into the ranks of the cohort, soaked by the spray from the river and spattered with the blood of comrades and enemies.
Maximius, standing behind the centre of the cohort, met Macro's wild-eyed gaze with a look of intense and bitter hatred. 'You've lost the ford.'
There was no time for any exchange of words, and Macro turned round and formed up with his men, facing the endless tide of barbarians surging across the ford towards the cohort. They piled into the shields lining the edge of the ford and hacked and thrust at the Romans behind.
At first the legionaries held their ground, exhausted as they were. The relentless years of training paid off in the steady one-two rhythm of punching the shield boss forward, then withdrawing it as the short sword stabbed at the enemy; a pause for the counterstroke and then the sequence was repeated. As long as the line held. If it broke then all the advantages of tight formation and strict training that made them so ruthlessly effective in battle would be lost in an artless test of strength and violent savagery.
As the weight of enemy numbers increased the cohort began to give ground. It was almost imperceptible, but Cato, positioned on the end of the line and not yet engaged, saw the Roman centre begin to bulge backwards. Maximius saw it too and turned to the decurion and the handful of survivors of his squadron.
'Find the legate and report the situation to him. Go!'
The decurion saluted and turned his horse downriver, ordering his men to follow. He glanced back over his shoulder one last time at his comrades. 'Good luck, lads!'
Then he was gone, the pounding of hoofs lost against the clatter of weapons and wild shouts of men locked in the desperate struggle.