Latifundia, massive estates owned by the rich, dotted Campania and Apulia, the regions south of Rome. Romulus was amazed by the fields and hillsides covered in wheat, vines, olive and fruit trees. At night the groves supplied them with apples, plums and pears, juicy food that the young man had rarely tasted before. In daylight, impotent rage filled Romulus as he spied the countless miserable slaves working the farms, their ankles manacled together. Supervisors stood over each group, their whips ready to use at the slightest opportunity.

Every estate was the same.

Romulus quickly realised that the whole country ran on slave labour. No wonder Rome was so wealthy, when tens of thousands of its subjects had to work for nothing. The two friends had endless debates as they marched, Romulus imagining that they had killed Memor and started a second slave rebellion instead of ruining it all by visiting Publius' tavern. He still had very mixed feelings about that night. Because they had gone out, he had met Julia. Although he knew it was only an infatuation, the thought of her still made his heart flutter. The feeling was mixed with guilt at what might have been. If they had refrained from going out, perhaps they would have been marching past those very latifundia by now, freeing the slaves instead of skulking past like animals.

Brennus had not grasped the extent of the Republic's captive population before either, and was similarly outraged. On their journey he observed workers of every race and creed under the sun. Rome's appetite for slaves was insatiable, fed purely by war, and the annihilation of the Allobroges was obviously far from unique. To end up on Italian latifundia, those he saw must have suffered as he had done. It was abhorrent to him, but Brennus felt powerless to change things. He was no Spartacus. A warrior, yes. Not a general. He had been feeling guilty about not escaping the ludus sooner, but that was ebbing now. Maybe their rebellion would have succeeded. But more probably it wouldn't have. And how could Ultan's words have made any sense if he was fighting battles up and down the peninsula?

A journey beyond where any Allobroge has gone. The phrase had become Brennus' mantra; everything else paled before it. It was only by seeing the druid's prophecy fulfilled that he could imagine justifying his decision to flee, rather than to defend, his village six years before.

The two friends covered nearly three hundred miles in less than twenty days.

There had been plenty of time to brood.

Seeing the slave population had increased both men's desire to discard all memories of their own captivity. Romulus' and Brennus' brands were permanent evidence of their status and discovery once they were in the army would mean instant crucifixion. After a quick discussion, they agreed that there could only be one solution. Having found a suitable grove in the hills above Brundisium, Brennus had lit a fire and sharpened his dagger until it could shave a man. Encouraging Romulus to bite down on a piece of wood, he had heated the blade over the flames before removing the hated letters 'LM' with a few deft cuts. Blood ran down Romulus' arm in little lines and dripped to the ground. His eyes bulging in pain, he watched as the Gaul closed the wound using lengths of gut from an unravelled spare bowstring.

Brennus grinned. 'Might not be pretty, but it'll do. Keep it hidden for a while, and if anyone sees, you can say it was from a sword cut.'

The crude sutures would leave a rough scar, nothing like the neat work of the Greek surgeons in Rome who were paid by wealthy ex-slaves to remove their brands. Romulus didn't care. Memor's proof of ownership was gone for ever. But when he pulled out his own knife a moment later and reached for the Gaul's leg, Brennus stopped him.

'We can't both have a freshly stitched wound. Burn mine. Logs fall out of fires all the time.'

Romulus protested weakly, but he knew his friend was right. There was no mercy for escaped slaves. To avoid suspicion, they had to be different. He heated the dagger until the blade was glowing a dull red and then gritting his teeth, applied it to Brennus' calf. An instant smell of burning hair and flesh filled his nostrils.

The huge Gaul grimaced, allowing the searing pain to cleanse away some of the memories of slavery. 'We 'll stay here for a while,' he announced with a smile. 'Lick our wounds and get some rest. Then we can go down to the port.'

His smile was infectious and Romulus grinned.

One last ordeal, but now they were truly free.

Brundisium's harbour was humming with activity. A large town, it had been transformed by the arrival of Crassus' army. Thousands of soldiers, tons of equipment and weapons filled the narrow jetties, waiting to embark for Asia Minor. The skyline was a forest of masts. Dozens of triremes rocked gently in the water, tied close together. Sailors swarmed back and forth, cursing the clumsiness of their passengers.

Mules brayed as they were forced down wooden gangways on to ships. Officers barked orders, pushing and shoving men into line. Messengers scurried between units, relaying orders.

Brennus and Romulus worked their way through the throng, searching for somewhere to join up. At length they found a makeshift desk of sacks of flour on the main dock. An old centurion was standing behind the temporary arrangement, bawling orders at new recruits.

He stared calculatingly at the dirty pair as they came to a halt.

'Farmers, eh?'

'That's right, sir.'

Romulus kept silent, taking in the phalerae hanging from the moulded leather breastplate and the silver torque round his neck. This was clearly a brave man.

'Well armed, aren't you?' He pointed at the heavy spears, the bow, swords and daggers, the well-made shields.

'We 're from Transalpine Gaul, sir,' explained Brennus. 'The bandits are plentiful and we have to know how to fight.'

'Hmmm. Thought you were a Gaul.' The officer eyed Brennus' bulging muscles and the scars on his arms. 'Why come to Brundisium?'

'The great general is leading an army to Jerusalem. I'm told the booty will be good.'

'So all the new recruits say.' The centurion scratched short grey stubble, looking Brennus up and down shrewdly. 'You're not escaped slaves?'

'No, sir.' The Gaul kept a blank face, Romulus copying him. Aping the Roman military cut, both men had cut their hair short that morning.

'Slaves are forbidden to join the military under any circumstances. It is a crime punishable by death. Understand?'

'We are free men, sir.'

The officer grunted, considering the tally on the calfskin parchment before him. 'And the lad?'

'Fights better than most grown men, sir.'

'Does he, by Jupiter?'

'Taught him myself, sir.'

'A bit young, but I suppose he's as big as most.' The centurion pushed forward a stylus. 'You enlist for three years minimum. Stay with the army for twenty and you'll be granted Roman citizenship. The pay is a hundred denarii per year in equal instalments every four months. Depending on the situation.'

'Situation, sir?' Romulus spoke for the first time, affecting Brennus' thick accent as best he could.

'If we're in the middle of a damn war, you don't get paid!'

'A hundred denarii?' Romulus turned to his friend with disbelief. The purse from Pompey alone had contained five times that amount.

Brennus frowned.

The centurion laughed, misinterpreting the remark. 'A lot of money,' he said. 'Crassus' son Publius is a generous man. He wants the finest infantry to fight beside his cavalry.'

Romulus grinned vacuously as if he had only just understood. After all, they weren't joining Crassus' army for the wages.

'You provide your own clothes and weapons. Costs for equipment, food and the burial club get deducted from pay. And when I tell you to do something, do it fast! Otherwise you'll feel this across your backs.' He slapped a vine cane on the sacks of flour. 'I command the cohort, but I'm also your centurion! Clear?'