Looking up, Cato saw through the haze of dust that the rearmost ranks of the Nubian cavalry were falling back, away from the arrows that rained down mercilessly. The fear swiftly spread through the enemy and as the last of them turned their mounts and galloped off, Cato looked down the battle line. The auxiliaries stared after the Nubians in silence for a moment, too stupefied by the blood rushing through their veins to realise that they had beaten the enemy off. Then Prefect Herophilus thrust his bloodied blade up and let out a roar of triumph, instantly taken up by the rest of his men as they watched the enemy flee. Bodies of men and horses, many still living, lay scattered across the ground amid the angled shafts of arrows.

As the cheers began to die away, Cato was aware of the sound of fighting from the other flank where the enemy had made another attack in an effort to break the Roman cavalry. Cato squinted to make out the details. It seemed that the Alexandrian cavalry unit was holding its own well enough and on the left flank, the archers and bolt throwers were taking their deadly toll.

Cato sheathed his sword and walked his horse over to Herophilus. 'Well done! That's fine work by your men. Get them re-formed and ready for the next charge.'

'Yes, sir!'

Cato beckoned to Junius and the others and then trotted back towards the centre of the line. He made a quick estimate of the cohort's losses. No more than a tenth of the cavalry had been lost in the first struggle but the Nubians would surely make another charge. Each time they did, the cohort's strength would be whittled down. The Nubian army must be broken before such attrition broke the Roman cavalry.

The small party of officers made their way across the rear of the Roman line and returned to the centre. Macro looked back and nodded a relieved acknowledgement that Cato was still alive, then turned to face the front. Over the helmets of the First Cohort, Cato could see the main bulk of the enemy army advancing straight at them, no more than half a mile away, dense blocks of infantry, with the most heavily armoured making up the centre of the line under the banner of Prince Talmis. Cato wondered if Ajax was there amongst them, with the last of his followers from Crete. For an instant he fervently hoped that fate would give him, or Macro, the chance to face the gladiator one last time to settle the consuming hatred that had brought all three men to this battlefield on the fringe of the Empire.

He thrust thoughts of Ajax aside and turned to one of his orderlies. 'Tell the commanders of both bolt-thrower batteries to target the enemy infantry as soon as they come within range. The same order to the archers. Go.'

The officer nodded and wheeled his mount around and galloped off. Cato turned his attention back to the Nubians. It was impossible to gauge their number through the haze of dust rising up a short distance behind the leading ranks. If this was Prince Talmis's main blow, then there could be more than twenty thousand men tramping across the level ground towards the Roman line, three men to each of Cato's. The sheer weight of numbers would be certain to drive the small army back, which was what Cato had allowed for, indeed counted on, in his plan.

The steady rhythm of the enemy's drums and the clash of cymbals and blare of horns swelled in volume as the host advanced. Once the centurions were satisfied that the lines of their men were dressed as smartly as possible, they took up their places at the right of their commands and waited in silence. The Nubians were now close enough for Cato to make out their officers shouting encouragement and waving their men on with their gleaming swords. There was a moment when Cato felt tempted to say something, some word of comfort to the men around him, but he realised it would only betray the anxiety that bound his stomach in a vice-like knot. Far better to remain silent and seem calm and imperturbable in the face of an approaching sea of enemies.

On both sides the crews of the bolt throwers began to ratchet back the torsion arms with a sharp metallic clatter. Then the heavy, iron-tipped shafts, as long as a man's arm, were loaded on to the weapons and there was a brief pause before the order bellowed out, 'Loose!'

The brief chorus of cracks drowned out the enemy instruments as a veil of missiles seemed to waft up and over the intervening ground before disappearing in amongst the Nubian foot soldiers. Cato well knew the damage that such a volley could wreak amongst dense formations of men and yet the enemy came on without any sign of hesitation, or diminution of their battle cries. It was as if the host had simply absorbed the missiles rather than lost scores of men, pierced through and hurled back against their comrades by the force of the impact. A second volley arced towards the enemy, and this time the bolts struck some of the leading men, tearing through two or three at a time. Then the dead and wounded were lost from sight as their companions stepped round or over them and continued the advance.

At just over two hundred paces the Roman archers loosed their first arrows, with a sound like a rush of wind through the leaves of some great tree. The arrows lifted high into the air and then dashed down amid the enemy, and still they came on at an unbroken pace, hefting their shields round and grasping their weapons firmly as they closed on the waiting Romans.

'Front rank!' Macro called out. 'Prepare javelins!'

The first line of legionaries raised their javelins in an overhand grip, shifting side on to the Nubians as they took two steps forward and waited for Macro's order to hurl their weapons.

Just within a hundred paces of the Roman line the Nubians shuffled to a halt. They continued to yell their cries and taunts, and waved their weapons to challenge their foe.

'What are they waiting for?' asked one of the tribunes. 'Why don't they charge?'

Cato knew why, well enough, and drew a deep breath. 'Stand by to receive missiles!'

CHAPTER THIRTY-FIVE

As the order was hurriedly repeated down the line, a mix of slinghot and arrows began to rise up over the head of the front ranks of Nubians. They were shooting blind, Cato realised with a small measure of relief. Even so, some of their missiles were bound to strike home. He turned to his officers. 'Better dismount, gentlemen. Take what cover you can find.'

As he dropped down from his saddle, Cato gestured for one of the command post orderlies to bring him a shield and he swiftly raised it up as the first of the enemy slingshot began to whip down, smacking into the sandy ground. All around, the arrows and slingshot clattered off the shields of the legionaries. A handful of arrows pierced the leather covers and lodged in the layers of laminated wood, while other missiles succeeded in striking home. Close by, Cato saw an optio's head snap back as he caught a deflection off the top of his shield. The slingshot shattered his skull and the man fell to the ground and lay still. More men were struck, the majority wounded, but some killed outright, amid the ranks of the legion. Macro's cohort, being the largest and nearest to the enemy, took the brunt of the damage. Keeping a watchful eye out for any missiles, Cato was gratified by the sight of the men closing ranks wherever one of their comrades was struck down.

The exchange of missiles from both sides continued unabated for what seemed far longer than it actually was. Cato wondered how much his men could take before their ranks were thinned out enough for the enemy to break through on their first charge. Already, over a hundred of his men were down, he estimated, with more being hit all the while. And then the enemy's barrage slackened and died away as they began to expend their ammunition. Several horns blasted out and the Nubians let out a bloodthirsty roar at the signal, and then surged forward in a charge over the final strip of sand separating them from the Romans.