‘This your protégé, Macro?’ said the man next to him.

Macro nodded.

‘A little young for an optio, wouldn’t you say?’

‘We’ll see,’ Macro grunted, casting his eyes over the optio in his ill-fitting tunic and cloak. The centurion circled slowly, making a close examination of the young man’s equipment, testing the buckles with a sharp tug, and tilting Cato’s head back to ensure the helmet strap was fastened. ‘You’ll do. Right, while we’re out of the base you stick by me and do whatever I say. No wandering off, no nothing without my say-so. Understand?’

‘Yes, sir.’

‘Now, join the front of the last century in line — that’s the Sixth. Wait for me there.’

‘Sir?’

‘What is it?’

‘How long are we going to stand here?’ asked Cato, already shivering.

‘You just can’t wait, can you?’ Macro shook his head. ‘Not long now, boy, we’re just waiting for the tribune.’

One of the other centurions spat on the frozen ground. ‘Bet the bastard’s still in bed.’

‘Doubt it,’ Macro replied. ‘The legate’s on his case. Seems he wants to test Vitellius. But this little trip’s nothing more than an exercise in command. Even Vitellius would struggle to screw it up.’

‘Macro, old son, never underestimate the incompetence of staff officers. They’re born and bred for disaster…’

The exchange fell out of earshot as Cato made his way towards the standard rising over the Sixth Century. A few of the men eyed him curiously as he approached.

‘You’re Macro’s optio?’ the standard bearer asked.

‘Yes.’

‘He mentioned he had a new boy, but I didn’t dream he was being so literal.’

Cato opened his mouth to reply before he got control of his feelings. Then he blushed and fumed silently.

‘Just stick close to the centurion and me, lad, and you’ll be all right.’

As Cato stood at the head of the century the other optios had been given the nod and were now moving down the ranks quietly ordering the men into column of fours, and dressing the lines so that in a short time the cohort was formed up, at ease, and ready to move off. Cato could not help but be aware of the growing sense of impatience as the men stood and waited. The sun had cleared the dawn mist lingering along the battlements and was washing the cohort in a weak orange glow.

And still they waited. For long enough that the cold began to take numbing advantage of their stillness.

At last the clatter of a walking horse sounded from the centre of the fortress and Cato turned to see a red-cloaked officer approaching, feathered plume bouncing from the crest of his helmet. At his approach, the group of centurions broke up and returned to their centuries. Vitellius trotted down the column and took up station at its head. A single word of command later and the lead century marched off, heading through the gate and on to the track beyond the walls. The succeeding centuries followed suit and, as the rear of the Fifth century moved forward, Macro counted off ten paces and then bellowed out the order to advance.