Slowly the vast numbers of the enemy began to tell and the First Cohort was forced to give ground, step by step. Men were falling, caught by spear thrusts through gaps in the shield wall, or sometimes overwhelmed when one of the Nubians managed to wrench a shield aside long enough for one of his fellows to strike a blow at the legionary behind. Though the losses of the Nubians were far greater, Cato could see that the four-deep line with which the cohort had begun the battle was reduced to three men in most places. The bowed-out formation was steadily flattened, and then began to curve inwards as the more solid formations on either side of the First Cohort still managed to hold their ground. Out on the wings the cavalry cohorts were fighting off a second, half-hearted attack by the enemy horsemen. The battle was going to plan, Cato realised, and he promised a generous offering to Fortuna if luck continued to favour the side of Rome, as the battle entered the decisive phase. It all depended on Macro and the First Cohort, holding their formation as they gradually fell back.

‘Sir?’

Cato turned to see an optio standing beside his horse. ‘Yes?’

‘Message from the Prefect Scyllus, sir. He begs to report that his archers are running out of arrows.’

‘Very well. Tell the prefect to save what he has left and form his men up behind the reserves.’

‘Yes, sir.’ The optio saluted and turned to run back towards his unit.

As the rain of arrows stopped, the enemy drums beat with renewed energy and the horns blared out to offer encouragement to the Nubians. The pressure continued and the Roman centre was driven inwards as the enemy pushed forward, heedless of their own dead strewn across the battlefield beneath their feet. Prince Talmis’s body of heavy infantry had pushed their way through the throng and now engaged the tiring men of the First Cohort. Well trained and equipped, they were able to fight the Romans on a more equal footing and more of Macro’s men were cut down. The line was growing perilously thin as Cato watched. Yet he dare not give the order to spring the trap before he was certain the moment was right.

‘Sir!’ Junius shouted, thrusting his arm out. ‘They’re going to break through!’