'Issam! Down!' shouted Learchus.

  The Scout-sergeant dived to the side and darted between two tumbled columns of bleached rock as the second of the two skimmers streaked over his place of concealment. They were nimble vehicles, dart-shaped with what looked like a curving roll bar running from the engine nacelles at their prows to their tapered rears. Two tau warriors sat in the cockpit, only their shoulders and heads visible.

  Learchus watched the first skimmer's velocity bleed off as it arced up on its turn, and dropped to one knee. He pulled his bolter in tight and sighted along the length of the weapon. A boltgun was no one's idea of a sniper weapon, but a Space Marine made do with whatever armaments were at his disposal. He let out a breath, and waited until the skimmer was at the apex of its turn, its speed greatly reduced.

  He pulled the trigger, feeling the enormous kick of the weapon. The mass reactive projectile streaked through the air, its tiny rocket motor igniting as soon as it left the barrel. The shot was true, and no sooner had Learchus fired than he was running towards his target.

  The pilot's head exploded as the bolt-round punched through his helmet and detonated within his skull. The skimmer dropped to the ground with a thump of metal on rock, and the co-pilot struggled to release his restraints as he saw Learchus bearing down on him.

  A burst of blue bolts streaking past his head told Learchus that the last skimmer had seen him. He risked a glance over his shoulder and saw it arcing towards him. Stuttering blasts of gunfire fizzed through the air, and one struck him low on the hip. Learchus staggered, feeling the heat of the impact burning his skin, but kept running. 'Cover fire!' he yelled.

  Issam broke from behind the fallen columns of rock and unleashed a hail of shots at the approaching skimmer. It broke off its attack run and heeled over as it pulled away from the lethal volley. The tightness of the turn bled speed, and the wounded Parmian fired his bolt pistol one-handed at the vehicle's exposed underside. The shot penetrated the lighter armour of its fuselage, and exploded upwards through the pilot's body, exiting in a spray of bone from his chest.

  The co-pilot of the skimmer Learchus had brought down was free of his harness, but it was too late for escape. Learchus wrapped a hand around the tau's neck and dragged him from the vehicle. With the bare minimum of effort, he crushed the alien's neck and dropped him to the ground.

  The second skimmer came down with a jolt, but surviving the death of his comrade only delayed the co-pilot's demise by moments. The alien expertly disembarked from the skimmer, and drew his sidearm, but it was a futile act of defiance. Issam put two expertly aimed shots through his chest, and he fell back.

  Learchus let out a long shuddering breath as Issam jogged over to him, his bolter cradled close to his chest. Parmian followed him, and the last surviving scout, Daxian, formed up on their sergeant.

  The battle had lasted seconds at most, but it felt like longer.

  'We were lucky,' said Learchus. 'If they had come with the proper amount of force we would be dead.'

  'This is simply a reprieve,' said Issam. 'These scouts will be missed soon, and future hunters will not come so ill-prepared.'

  Learchus turned his gaze to the south, to where lines of smoke and a haze of energy hung over the horizon. The gleam of the port city's towers was so close that he felt he could reach out and touch them.

  'Praxedes is only three or four kilometres away,' he said. 'It is so close.'

  'It might as well be on Macragge for all we can get near it,' said Parmian, pointing to where the sunlight glinted on what looked like leafless ceramic trees in the distance. 'There are ring upon ring of drone sentry towers guarding every approach, and our camo-capes won't fool them.'

  Learchus looked down at the corpse of the tau co-pilot at his feet. Then he looked at the skimmer vehicle. An idea began to form in his mind.

  'You are correct, Parmian,' said Learchus. 'We cannot get through as Space Marines, but the onboard systems of these skimmers are no doubt equipped with the correct identity codes to pass between the sentry towers unharmed.'

  Parmian frowned. 'But how can you retrieve the codes? You don't know how these machines work.'

  Learchus dropped to his knees and removed the tau warrior's helmet. The alien's features were twisted with the pain of his last moments of life. Learchus turned the head onto its side and took the combat blade a grim-faced Issam handed him.

  He placed the long, serrated edge against the skin of the tau's temple and began sawing.

  'Not yet I don't,' he said.

  KOUDELKAR SHONAI POURED another glass of the warm tisane from the plain cylindrical pot his tau facilitator had provided him with that morning. The drink was sweet and had a deliciously fragrant aftertaste, about as far removed from the bitter taste of caffeine as it was possible to get. He set the pot down on a round tray, and settled back in the contoured plastic of his chair to read.

  Like everything in his quarters, from the bed to the ablutions cubicle, the chair was simply and functionally designed, moulding its form to match his seated posture. It provided comfort that the most gifted human ergonomic designers could only dream of producing.

  Koudelkar sipped his drink and returned to the device he had been studying all morning.

  It was a flat rectangular plate, not unlike an Imperial data-slate, though it was far lighter and didn't keep shorting out every ten minutes. A wonderfully crisp display projected picter images of people at work and at play. They were ordinary men and women, and though there was nothing special about what they were doing, where they were doing it was quite remarkable.

  Everyone in the moving images inhabited wondrous cities of clean lines, artfully designed boulevards, parks of vibrant green and russet brown, all set amid gleaming spires of silver and white. Aun'rai had told him that this was Tau, cardinal world of the empire and birthplace of the tau race. To see human beings in such a place was incredible, and although Koudelkar knew that images could be manipulated, this felt real and had a ring of truth to it that he felt was totally genuine.

  Every man, woman or child in the films was dressed in more or less identical clothing that bore various insignia of the tau empire. Koudelkar had heard the rumours of defections to the tau empire; such stories were told in hushed whispers, for to entertain any notion of aliens as anything other than vile, baby-eating filth was punishable by death.

  Everything Koudelkar had seen since his capture gave the lie to the idea of the tau as murderous aliens hostile to humanity. He had been treated with nothing but courtesy since his arrival, and his daily discussions of the Tau'va, the Greater Good, with Aun'rai had been most illuminating.

  Each morning, Aun'rai would join Koudelkar in his quarters and they would speak of the tau, the Imperium and a hundred other topics. Much to his surprise, Koudelkar had warmed to the tau ambassador, discovering that they had much in common.

  'The Greater Good is a fine idea in theory,' Koudelkar had said upon first hearing Aun'rai talk of it, 'but surely unworkable in practice?'

  'Not at all,' said Aun'rai with a soft shake of his head.

  'Surely selfish desires, individual wants and the like would get in the way.'

  'They did once,' said Aun'rai, 'and it almost destroyed our race.'

  'I don't understand.'

  'I know you do not,' Aun'rai had said. 'So let me tell you of my race and how we came to embrace the Greater Good.'

  Aun'rai had placed his staffs of office beside him and wove his hands together as he began to speak, his voice soft and melodic, laced with a wistful melancholy.

  'When my race took its first steps, we were like humanity: barbarous, petty, and given to greedy and hedonistic impulses. Our society had branched into a number of tribes, what you might call castes, each with its own customs, laws and beliefs.'

  'I'd heard that,' said Koudelkar, 'four castes, like the elements; fire, water and suchlike.'

  Aun'rai smiled, though there was something behind the expression Koudelkar could not divine. Irr
itation or sadness, he couldn't tell.

  'Those are labels humans have applied to us,' said Aun'rai at last. 'The true meanings of our caste names carry much complexity and subtle inferences lost in such prosaic terms.'

  'I'm sorry,' said Koudelkar. 'It's what I've been told.'

  'That does not surprise me. Humans have a need for definition, for yourselves and for the world around you. You struggle with concepts that do not easily sit within defined boxes. I know something of your race's history, and with everything I learn of you, I grow ever more thankful for the Greater Good.'

  'Why?'

  'Because without it, my race would be just like yours.'

  'In what way?'

  Aun'rai raised a hand. 'Listen well and you will learn why we are not so different, Koudelkar.'

  'Sorry,' said Koudelkar, 'you were speaking of the castes.'

  Aun'rai nodded and continued. 'The tau of the mountains soared on the air, while the plains dwellers became hunters and warriors of great skill. Others built great cities and raised high monuments to their craft, while those without such skills brokered trade between the different groups. For a time, we prospered, but as time passed and our race grew more numerous, the various tribes began to fight one another. We called this time the Mont'au, which in your language means the Terror.'

  Aun'rai shuddered at the memory, though Koudelkar knew he could not have been there to see any of this. 'The plains dwellers allied with the tau of the mountains and took to raiding the settlements of the builders. Skirmishes became battles, battles became wars, and soon the tau race was tearing itself apart. The builders had long known how to fashion firearms, and the traders had sold them to almost all of the tribes. The bloodshed was appalling, and I weep to think of those days.'

  'You're right, that does sound familiar.'

  'We were on the verge of destruction. Our species was sliding towards a self-engineered extermination when we were saved on the mountain plateau of Fio'taun. An army of the air and fire castes had destroyed vast swathes of the land, and now laid siege to the mightiest city of the earth caste, the last bastion of freedom on Tau. For five seasons, the city held against the attacks until, at last, it was on the verge of defeat. This was the night the first of the Ethereals came.'

  'The who?'

  'I have not the words in this language to convey the true meaning of the concept, but suffice to say that these farsighted individuals were the most singular tau ever to walk amongst my people. All through the night, they spoke of what might be achieved if the skills and labours of all castes could be harnessed and directed towards the betterment of the race. By morning's light, they had brokered a lasting peace between the armies.'

  'They must have been some speakers,' observed Koudelkar, 'to halt a war like that so quickly. How did they do it?'

  'They spoke with an acuity that cut through the decades of bloodshed and hatred. They showed my people the inevitable result of continued war: species doom and a slow, moribund slide into extinction. None who heard them speak that night could doubt the truth of their words, and as more of the Ethereals began to emerge, the philosophy of the Greater Good was carried to every corner of the world.'

  'And that was it?' asked Koudelkar. 'It just seems, well, a little too… easy.'

  'We had a choice,' said Aun'rai, 'to live or die. In that respect, I suppose it was an easy decision to make. Your race has yet to face that moment, but in that one night, my people saw the truth of the Ethereals' words with total clarity. Almost overnight our society was changed from one of selfish individualism to one where everyone contributes towards our continued prosperity. Everyone is valued and everyone is honoured, for they work towards something greater than they could ever achieve alone. Does that not sound like what happened when your Emperor emerged and took the reins of humanity? Did he not attempt to steer your race's path from destruction to enlightenment? That he failed in no way diminishes the nobility of his intent. What he tried to do is what the tau have managed to do. Now, does that not sound worthwhile, my friend?'

  'Put like that, I suppose it does,' agreed Koudelkar, 'and it really works?'

  'It really does,' said Aun'rai, 'and you could be part of it.'

  'I could?'

  'Of course,' said Aun'rai. 'The Greater Good is open to all who embrace it.'

  That thought was uppermost in Koudelkar's mind as he set the display unit down and sipped his tisane. The idea of renouncing the Imperium sent a chill down his spine and made his hands tingle. Men had suffered the torments of the damned in the dungeons of the Arbites for far less, and Koudelkar's mind recoiled from the thought, even as he relished the idea of a society where he was not constrained by petty bureaucrats and restrictive legislation: a society where he was valued for his contribution, not held back from advancing a better world for his people.

  His good mood evaporated as the door to his quarters slid open and Lortuen Perjed entered. The adept wore a serious expression, and Koudelkar crossed his legs and folded his hands in his lap as he waited for him to speak.

  'Good afternoon, Lortuen,' he said.

  'I'll keep this brief,' said Lortuen.

  'That will be a refreshing change,' replied Koudelkar.

  Lortuen frowned, but pressed on. 'I have news of the progress of the war, and we need to talk about fighting the tau. The men are ready and we have a plan.'

  Koudelkar sighed. 'Not this again. I told you before that you were wasting your time. There's nothing we can do, we cannot escape.'

  'And I told you that it is not about escape. Damn it, Koudelkar, you have to listen to me!'

  'No,' said Koudelkar, 'I don't. My eyes are open now, and I think I misjudged the tau. As matter of fact, I think we all did.'

  'What are you talking about?'

  'I mean that for all your fine talk of the Imperium, it is clear to me that it is a corrupt institution that no longer even remembers why it was created or the ideals for which it once stood.'

  'You have gone mad,' said Lortuen. 'It's that Aun'rai! Every day he fills your head with lies. And you're falling for them.'

  'Lies?' said Koudelkar. 'You were the one that told me the Imperium would not mourn our passing. We are already dead men, Lortuen, so what does it matter what we do?'

  'It matters even more, Koudelkar,' said Lortuen. 'If we can abandon our beliefs in the face of adversity, then they're not beliefs at all. Now, more than ever, we have to fight these degenerate xenos!'

  'I will tell you what is degenerate,' snapped Koudelkar, surging from his seat. 'Even as we face enemies from all sides, our race still fights amongst its own kind. We are told that the galaxy is a hostile place, and everywhere we turn there are foes, but does this unite us or bring us together? No, for we are so self-absorbed that we forget what it is to belong to something greater. Mykola was right, she knew that—'

  'Mykola is dead,' said Lortuen.

  Koudelkar felt like he'd been punched in the gut. He sank back into his chair and struggled to think of what to say. 'What? How do you know?'

  'The same drop-ship that brought Aun'rai back also brought Jenna Sharben in.'

  'The enforcer chief?'

  'Yes. She was badly hurt, but the tau have treated her wounds and she's conscious again. She told me what happened.'

  'Does my mother know?'

  'No, I thought it would be best coming from you.'

  Koudelkar nodded absently. 'How did my aunt die?'

  'Does it matter?' asked Lortuen. 'She is dead. She paid the price for her treachery.'

  'Tell me how she died,' demanded Koudelkar. 'I will find out, so you might as well tell me now.'

  Lortuen sighed. 'Very well. She died in the Glasshouse. Prelate Culla beat her to death to learn what information she had given the tau.'

  'Culla murdered her? I knew that bastard was insane!'

  'If it's any consolation, Culla's probably dead too,' said Lortuen. 'The tau killed him before they escaped from the prison.'

  'The Imperium kil
led Mykola,' said Koudelkar with an awful finality.

  'No, her choices killed her,' said Lortuen.

  'Get out!' roared Koudelkar. 'Get out and never speak to me again. I will have nothing more to do with you or your petty plans of resistance, and I will have nothing more to do with the Imperium!'

  'That's the grief talking,' said Lortuen. 'You don't mean that.'

  'I mean every word of it, Perjed!' shouted Koudelkar. 'I spit on the Imperium, and I curse the Emperor to the warp!'

  EIGHTEEN

  THUNDEROUS EXPLOSIONS LIT up the dawn as the charges placed by the combat engineers went off one after the other in quick succession. Throughout the night, the centre spans and supports built into the gorges of the Aquila, Owsen, Spur and Diacrian Bridges had been rigged for destruction, and as sunlight threw the defenders' shadows out before them, the word was given to destroy the crossings.

  The bridges had stood for hundreds of years, though there was little sense of history to them. They had not the pedigree of the Imperator, and the lost secrets built into its structure that made it virtually indestructible had no part in the construction of those around it.

  Rock blew out as gigantic stone corbels were destroyed, and the supports built deep into the walls of the gorges blasted free. Spars of metal that had not seen sunlight for centuries tumbled to the rivers far below, trailing tank-sized chunks of reinforced plascrete and rebars.

  The Owsen Bridge was the first to fall, the eastern end giving way and tearing from the rock. The roadway crazed and buckled as the metal beneath snapped, and the immense weight of it all ripped the supports from its other end. Within moments, the entire span was tumbling into the river. The Aquila soon followed it, its structure twisted and blackened by the explosions. When the dust cleared, the engineers saw that the thoroughness of their labours had not been wasted. Nothing remained of either bridge, and the route across the gorges through Barrack Town had been obliterated.

  Unfortunately, the same could not be said of the charges laid upon the Diacrian and Spur Bridges. As the echoes of the northern bridges' destruction faded, it was clear that something had gone terribly wrong with the demolition of the southern bridges.