'Worse than having Caliban descend into anarchy?' Luther countered. 'Don't worry, brother. I've given this much thought. We'll send in the Jaegers first. If it they appear to have matters well in hand, I'll release the new Astartes for immediate deployment to the fleet.'

Zahariel nodded, still uneasy. 'We need to root out their ringleaders,' he said. 'Drag them out into the open and confront them with their crimes. That will put an end to this lawlessness.'

Luther nodded. 'It's already begun,' he said. 'Lord Cypher is searching for them even as we speak.'

'Vox transmission from Destroyer Squadron Twelve,' Captain Stenius reported, joining the primarch at the strategium's primary hololith display. 'Long-range surveyors are picking up thirty vessels anchored in high orbit above the forge world. Reactor and sensor emissions suggest a mixed group of capital ships and heavy-grade cargo transports.'

Lion El'Jonson rested his hands against the burnished metal rim of the tank. A faint smile played at the corners of his mouth. 'Identification?'

Stenius shook his head. He was another veteran of the Legion's earliest campaigns, and bore the scars of his service proudly. His eyes were silver-rimmed, smoke-grey lenses set deeply into sockets that were seamed with scars. Nerve damage, inflicted by razor-sharp slivers of glass from an exploding hololith display, had transformed his face into a grim, inscrutable mask.

'None of the vessels in orbit are flashing ident codes,' the captain replied. 'But Commander Bracchius, aboard Rapier, claims the reactor signatures from two of the larger craft match those of the grand cruisers Forinax and Leonis.'

The primarch nodded. 'Formidable ships, but well past their prime. I expected as much: Horus has sent a second-line fleet comprised of renegade Imperial warships and Army units to plunder Diamat, while holding back his Astartes to protect Isstvan V.'

Stenius watched gravely as the hololith image above the table updated to reflect the new data. Diamat hung in the centre of the display, rendered in mottled shades of rust, ochre and burnt iron. Tiny red icons dotted the face of the world facing the approaching Dark Angels battle group, marking the approximate size and location of the enemy ships in orbit. Two of the icons had been tentatively classified as the two rebel grand cruisers, while others were given probable classifications based on their size and reactor emissions. Currently, the plot was showing no less than twenty cruiser-sized contacts anchored at Diamat, clustered around another ten heavy transports.

Nemiel, standing to Jonson's left on the other side of the hololith table, saw the concern in the captain's eyes. Second-rate or not, the rebels had twice as many capital ships as they did. For the moment, the Dark Angels enjoyed the advantage of surprise, and the enemy had been caught with little room to manoeuvre, but it was anyone's guess how long that would last.

Tension and uncertainty hung heavy in the dimly-lit chamber; Nemiel had observed it for weeks in the hunched shoulders and hushed exchanges between the fleet officers. During the two-month voyage from the Gordia system the news of Horus's betrayal and the nature of their clandestine mission had left indelible marks on the crew's psyche.

They've lost their faith, Nemiel thought. And why not? The unimaginable had occurred. Warmaster Horus, the Emperor's favoured son, has turned his back on the Emperor, and brother has been set against brother. He studied the faces of the men inside the strategium and saw the same fear lurking in the depths of their eyes. No one knows who to trust any more, he sensed. If someone like Horus could fall, who might be next?

The two hundred Astartes aboard the flagship dealt with their own uncertainties as they always did: honing their skills and preparing themselves mentally and physically for battle. Early in the voyage, Jonson had issued a set of directives organising his hand-picked squads into two small companies and establishing a rigorous training regimen to cement them into a cohesive fighting unit.

As the only Chaplain aboard the battle barge, Nemiel found himself personally tasked by Jonson to monitor the Astartes' training regimen and periodically certify their physical and psychological fitness. Since virtually all of the Legion's senior staff members had been left behind at Gordia IV, Nemiel soon found his responsibilities expanded to include logistics and fleet operations as well. He accepted the extra duties with pride and a certain amount of uneasiness as well, because the more he worked alongside Lion El'Jonson, the less sense the undertaking to Diamat made. Such a relatively small force couldn't possibly hold out for very long against the full strength of four rebel Legions, and Nemiel couldn't imagine that the Emperor would have ordered Jonson to attempt such a thing. The more he thought about it, the more certain he became that the primarch had ordered the expedition to Diamat for reasons that were entirely his own.

Nemiel focused his attention on the tactical plot and tried to put his foreboding aside. 'The rebels have us outnumbered, my lord,' he pointed out.

Jonson gave Nemiel a sidelong look. 'I can perform hyperspatial calculations in my head, brother,' he said wryly 'I think I can manage to count to thirty unaided.'

Nemiel shifted uncomfortably. 'Yes, of course, my lord,' he said quickly. 'I don't mean to belabour the obvious; I was just curious as to your strategy—'

'Easy, brother,' Jonson chuckled, clapping Nemiel on the shoulder. 'I know what you meant.' He pointed to the cluster of transports above Diamat. 'That's going to be their weak point,' he said. 'The success or failure of their mission depends on the survival of those big, lumbering ships, and they're going to hang like an anchor around the rebel admiral's neck.' He glanced back at Stenius. 'Any picket ships?'

Stenius nodded. 'Bracchius reports three squadrons of escorts in a staggered sentry formation,' he reported. 'They have detected our scouts and are coming about to engage. Time to contact is one hour, fifteen minutes at current course and speed.' He straightened, hands clasped behind his back. 'What are your orders, my lord?' he inquired formally.

The battle group had reached the point of no return. At this point, more than one and a half astronomical units from Diamat, the battle group still had time and manoeuvring room to come about and retreat from the system. If Jonson chose to press ahead, it would commit his small force irrevocably to battle.

Jonson did not hesitate. 'Execute attack plan Alpha,' he said calmly, 'and send the signal to launch all Stormbirds. Bracchius is to maintain speed and engage as soon as the pickets come within range. He'll have the honour of striking the first blow against Horus's rebels.'

Stenius bowed to the primarch and turned about, issuing a stream of orders to the flagship's command staff. Jonson turned his attention back to the tactical plot. 'Brother-Redemptor Nemiel, inform the company commanders to prepare their squads for an orbital assault,' he said. 'I expect we will be in position to launch in just over three hours' time.'

'At once, my lord,' Nemiel replied, and began to relay the command through his vox-bead. The image above the hololith tank updated again, this time depicting the approximate location of the battle group's three small scout squadrons. Ahead of them, three much larger squadrons were displayed in bright red, shifting slowly into a rough crescent formation. The arms of the crescent were oriented towards the oncoming Imperial scouts, like a pair of encircling arms. Blue and red numerical data, depicting the range, course and speed of the two formations changed with steadily-increasing speed.