Cato turned and saw the threat at once. A short distance to the right of Macro’s centre a single rank of legionaries was struggling to hold back the enemy. They thrust their shields forward and their iron-nail shod boots scrabbled in the sand and grit as they desperately tried to stand their ground. But it was like holding back a flood with a line of sticks. One of the men slipped and went down on his knee. At once two Nubians thrust his shield back, knocking the legionary flat. He was run through with a spear even before he could prop himself back up on an elbow. More men pressed through the gap and turned on the Romans on either side.

‘Shit,’ Cato muttered. The crisis of the battle had been reached. A rising cheer of triumph swept through the nearest of the Nubians as they scented victory. There was one chance left, Cato realised, wheeling his horse round to face the men of the reserve cohort. The legionaries stood to, shields resting on the ground, javelins held to the side.

‘The fate of the army is in your hands!’ Cato called out to them as he drew his sword. ‘You must save your comrades of the First Cohort and seal the gap in our line! For the Jackals!’

The centurions led their men in a throaty cheer that was unmistakably half-hearted. Cato could not afford the reserve to fail, and with the briefest of hesitations he swung his leg over the saddle and dropped to the ground. ‘Follow me!’