It was a dark night, made darker by the low clouds that completely obscured the sky; a sure sign that snow was on the way. From the gloom about him, Macro could hear a variety of sounds typical of the fortress existence that had been part of his life for over fourteen years now. Mules brayed from stables at the far end of each barrack block and the voices of soldiers, talking and shouting, drifted out through the wavering light of candlelit windows. A bellow of laughter peeled out of a barrack block he was passing, followed by a lighter female laugh. Macro halted mid-stride and listened. Someone had managed to sneak a woman into the base. The woman laughed again and then began speaking in thickly accented Latin and was quickly hushed by her companion. This was a flagrant breach of regulations and Macro abruptly turned towards the block and laid his hand on the latch. Then paused, thinking. By rights he should burst in, loudly bellowing in parade-ground fashion, send the soldier to the guard-house, and have the woman thrown out of the base. But that meant completing an entry in the punishment book – more bloody writing.

Gritting his teeth, Macro released his grip and quietly stepped back into the street, just as the woman let out a shriek of laughter to prick his conscience. A quick glance about to make sure that no-one else was there to witness his failure to act and Macro hurried on towards the south gate. Bloody soldier deserved a good kicking, and if he had been in Macro's century that's how he'd have been dealt with; no paperwork needed, just a swift kick in the balls to ensure the punishment fitted the crime. Still, from her voice she could only have been one of those nasty German tarts from the native settlement that sprawled just outside the base. Macro consoled himself with the thought of the legionary concerned coming down with a bad dose of the clap.

Although the streets were dark, Macro moved instinctively in the right direction since no legionary base deviated from the standard design used in all camps and fortresses. In a matter of minutes, he had emerged on to the wider thoroughfare of the Via Praetoria and marched towards the gate where the street passed through the walls to the south of the base. The sentry who had interrupted Macro at the latrine was waiting at the foot of the stairs. He led the way into the gatehouse and up the narrow wooden staircase to the battlement level, where a lit brazier cast a warm red glow around the sentry room. Four legionaries were squatting close to the fire playing dice. As soon as they saw the centurion's head appear above the stairs they stood to attention.

'Easy lads,' Macro said. 'Carry on.'

The wooden door to the battlements sprang inwards with the wind as Macro lifted the latch and the brazier blazed momentarily as he stepped outside and slammed the door to. Up on the sentry walk the wind was biting and whipped Macro's cloak behind him, tugging at the clasp on his left shoulder. He shuddered and snatched it back, holding it tightly about his body.

'Where?'

The sentry peered out through the crenellations into the darkness and pointed his javelin at a tiny flickering light swinging from the back of a wagon approaching from the south. Straining his eyes as he stared into the wind, Macro could make out the outline of the wagon and, behind it, a body of men plodding along the track. At the rear of the column came the more orderly progress of the escort whose job was to stop the stragglers slowing the pace. Maybe two hundred men in all.

'Shall I call out the guard, sir?'

Macro turned towards the sentry. 'What did you say?'

'Shall I call out the guard, sir?'

Macro eyed the man wearily. Syrus was one of the youngest men in the century and, although Macro had learned the names of most of his command, he knew little of their characters or histories as yet. 'Been in the army long?'

'No, sir. Only a year in December.'

Not long out of training then, Macro thought. A stickler for regulations, which he no doubt applied in every circumstance. He'd learn in time; how to compromise between following strict procedure and doing what was needed to get by.

'So then, why do we need to call out the guard?'

'Regulations, sir. If an unidentified body of men is approaching the camp in force the guard century should be called out to man the gate and adjacent walls.'

Macro raised his eyebrows in surprise. The quotation was word perfect. Syrus clearly took his training seriously. 'And what then?'

'Sir?'

'What happens next?'

'The duty centurion, after assessing the situation determines whether or not to call a general alarm,' Syrus continued tonelessly, then hurriedly added, 'Sir.'

'Good man.' Macro smiled and the sentry smiled back in relief, before Macro turned back towards the approaching column. 'Now then, exactly how threatening do you think that lot is? Do they scare you, soldier? Do you think all two hundred of them are going to charge over here, climb the walls and slaughter every mother's son of the Second Legion… Well, do you?'

The sentry looked at Macro, looked carefully at the flickering lights for a new moments and then turned back sheepishly. 'I don't think so.'

'I don't think so, sir,' said Macro gruffly as he punched the lad on the shoulder.

'Sorry, sir.'

'Tell me, Syrus. Did you attend the sentry briefing before the watch?'

'Of course, sir.'

'Did you pay attention to every detail?'

'I think so, sir.'

'Then you would recall me saying that a replacement convoy was due to arrive at the base, wouldn't you? And then you wouldn't have had to haul me out of the latrine and spoil a particularly good shit.'

The sentry was crestfallen and he could not bear the long-suffering expression on his centurion's face. 'I'm sorry, sir. Won't happen again.'

'You see that it doesn't. Or I'll have you on double duties for the rest of the year. Now get the rest of the lads ready at the gate. I'll deal with the recognition call.'

Shamefaced, the sentry saluted and went back into the gatehouse. Soon Macro could hear the sounds of the guard rousing themselves and descending the wooden stairs to the main gate. Macro smiled. The lad was keen and felt guilty about his mistake. Guilty enough to make sure that it never happened again. That was good. That's how dependable soldiers were made – there was no such thing as a born soldier, Macro reflected.

A sudden blast of wind buffeted Macro and he retreated into the shelter of the gatehouse. Inside he positioned himself close to the glowing brazier and let out a sigh of relief as the warmth soaked into his body. After a few moments, Macro opened the small viewing shutter and looked out into the night. The convoy was nearer now and he could make out the wagon in detail as well as the individual men in the following column. A miserable bunch of recruits, he thought, not an ounce of spirit in them. You could tell that by the apathetic way they trudged along, even though they were in sight of shelter.

Then it began to rain, quite suddenly, large drops flung diagonally by the wind that stung the skin. Even that failed to increase the pace of the convoy and, with a despairing shake of the head, Macro began the formalities. He opened the main shutter, leaned his head out of the window and filled his lungs.

'Halt there!' he shouted. 'Identify yourselves!'

The wagon reined in a hundred feet from the wall and a figure beside the driver rose to reply. 'Reinforcement convoy from Aventicum and escort, Lucius Batiacus Bestia commanding.'

'Password?' Macro demanded even though he knew Bestia well enough, the senior centurion of the Second Legion and therefore very much his superior.

'Hedgehog. Permission to approach?'

'Approach, friend.'

With a crack of the whip the wagoneer urged the bullocks up the rise that led to the gateway and Macro crossed over to the shutter that opened on to the inside of the fort. Down below, the sentries were clustered by the sidegate trying to keep out of the rain.