When the first horsemen came into view, Brennus actually smiled.

They were followed by at least two hundred more. Wearing polished scale armour that covered their bodies right down to their thighs, the Scythians were armed with lances, short-headed axes, swords and recurved composite bows. Maximising the full dramatic effect of their appearance, the riders reined in their red-coloured horses and stopped. About two hundred and fifty paces of snow-covered ground separated them from the battered Roman soldiers. Enough distance to reach a full charge.

I have accurately predicted the future, thought Romulus bitterly. But I did not see this.

Nearby, Novius blanched. What chance had they now?

He was not alone in his reaction. Finally taking in what awaited them, Romulus’ spirits plummeted. The divination was my best. And last. We will surely die now. With infantry and archers about to engage them from behind, and the cavalry blocking their way forward, there was nowhere to go. Except to Elysium. From somewhere, Romulus summoned the dregs of his faith in the warrior god. Mithras! Do not forsake us! We are worthy of your favour.

‘How did those bastards get here?’ shouted the older optio. Scythia lay to the south-east, with a long range of mountains between it and Margiana. The communicating passes would be blocked by snow for months.

There was only one answer.

‘They came around the peaks, sir,’ replied Romulus. Only that could explain the Scythians’ presence in midwinter.

‘Why now?’ demanded the optio.

‘To catch us unawares,’ Brennus said. ‘Who would expect an attack of this size at this time of year?’

‘The gods must be angry,’ spat Gordianus, making the sign against evil. Without anger, he glanced at Romulus. They were now comrades again. ‘Have we some hope?’

‘Hardly any,’ he answered.

Fearful mutters rose as this passed back through the ranks.

‘Let’s hope that Darius’ riders made it back then,’ said Gordianus. ‘Or the whole legion could be in danger.’

Behind the wedge, the massed ranks of Scythians were closing in. Simultaneously, the lead cavalryman flicked his reins, forcing his horse into a walk. The trot would be next, followed by the canter.

Their fate was about to be sealed.

‘What are your orders, sir?’ asked Romulus.

The optio looked uncertain. Normally there was a centurion present to tell him what to do.

‘If the horses get any speed up, they’ll cut us to pieces, sir,’ said Romulus.

The optio’s eyes flickered from side to side. On the heights were yet more warriors, with archers ranked behind. Escape that way meant fighting uphill, while being showered with arrows.

‘Let’s hit them quickly, sir,’ said Romulus. ‘That way, there’s a chance of smashing through.’

‘Charge them?’ queried the optio disbelievingly.

‘Yes, sir.’ Romulus glanced back at his frightened-looking comrades. Being hit at the gallop by the approaching horses would undoubtedly break them. And if that happened, the Scythian infantry would soon finish the job. ‘Now,’ he urged.

Unused to such pressure, the optio hesitated.

Brennus’ grip on his sword tightened. Romulus’ idea was the best, the sole, choice. If their erstwhile commander did not act, he would intervene. Lethally, if necessary.

Ignoring the confused junior officer, Gordianus turned to his comrades. He too thought Romulus was right. ‘We’ve only one chance,’ he shouted. ‘There’s no way back or on either side.’

‘What should we do?’ cried a voice a few ranks back.

‘Charge those fucking horses,’ cried Gordianus. ‘Before they reach top speed.’

The men looked dismayed, but did not protest.

Gordianus seized the moment. ‘Let’s do it!’

A defiant roar rose into the air. Novius and his cronies alone looked unhappy.

Romulus did not delay any longer. ‘Form wedge!’ he screamed. ‘Charge!’

The dull-witted optio had no time to respond. Desperate to survive, the legionaries launched themselves forward, carrying him with them.

Romulus kept his position at the front of the wedge. Brennus was pounding along on his right and Gordianus on his left. Soon they were running at full tilt, their shields held high against Scythian arrows. Those behind could not run and hold their scuta over their heads, which meant speed was vital. Once the mounted archers started releasing, the men in the middle would begin to die.

The Scythians responded to the Roman charge by urging their horses into a canter. All had arrows already fitted to their bowstrings. To a man, they drew back and prepared to release.

Less than a hundred paces separated the two sides.

Arrows shot up in graceful arcs and whistled down amongst the legionaries. The man directly behind Brennus went down, shot through the cheek. More shafts thumped into Romulus’ and Gordianus’ shields, making them awkward to carry, but there was no chance to rip them out. The veteran began muttering a prayer to Mars, the god of war.

Sweat ran down Romulus’ face and into the cut below his right eye. The salt stung, and he used the pain to focus himself. Some of the legionaries still had javelins left, he thought. Hit any of the Scythians and they’ll fall off. Open up the formation. Maybe give us enough room to get through. Mithras, protect us. Give us the strength to survive.

Fifty paces.

‘Ready pila,’ he yelled. ‘At my command, loose at will.’

Brennus smiled proudly. Romulus was turning into a leader.

Used to obeying orders, all those with javelins cocked their right arms back. Throwing while running was something they had all been trained to do.

Another flurry of arrows landed. Men made soft, choking noises as metal points skewered their throats; they screamed as eyeballs ruptured. Others were hit in the lower legs where their shields left them exposed. The falling bodies tripped up those immediately behind, and the legionaries at the rear had to just trample over them regardless. Injured, dying or simply winded, it was every man for himself now.

Thirty paces. Good javelin range.

‘Aim at the front riders,’ shouted Romulus one more time. ‘Loose!’

It was difficult enough to aim a pilum accurately when standing still. At the run, it was much harder. At Romulus’ command, eight or ten flew forward at the approaching horsemen. Most landed short. Just two found their mark, both striking the tattooed lead rider in the chest. Killed instantly, he toppled sideways and fell off. His body was trampled at once by the horses behind.

Gordianus cheered.

As Romulus had hoped, the dead man’s mount turned away from the Roman wedge, eager to escape. Now there was a small gap in the enemy ranks. He aimed straight for it.

But the other Scythians kept up a relentless fire of arrows. At twenty paces, they were hardly able to miss the unfortunate legionaries. With every step, men dropped into the snow, their blood staining it a deep red.

Someone tried to speak, but the words were unintelligible. Romulus turned his head. Gordianus had been hit at the top of his left shoulder, just above where his chain mail shirt ended.

The veteran’s face was stunned. He tried again to speak, but couldn’t. His hand rose to the wooden shaft protruding from his flesh, then fell away. Gordianus knew that pulling out the arrow would only kill him quicker.

Grief filled Romulus, but there was nothing he could do. Gordianus was a dead man.

Dropping his gladius, the veteran leaned over and firmly gripped Romulus’ shoulder with his right hand. His lips framed two silent words: ‘My friend.’

With a leaden heart, Romulus nodded.

With the last of his strength, Gordianus pushed him away. As he did, a Scythian spear took him in his exposed left side. At such close range, it punched straight through the chain mail. Gordianus’ eyes opened wide and he slumped to his knees.