The southern gateway had also seen heavy reinforcement since Nemiel had last been there. Work parties had expanded the walls on both sides of the tramway and refitted the destroyed weapon emplacements with new heavy guns taken from the forge. Archoi's adepts had also installed remote sentry guns at strategic points along the walls, and a cadre of hulking skitarii stood watch over the battlements alongside Kulik's Dragoons. Magos Archoi had proposed embedding skitarii units with the governor's men and the Dark Angels alike to enhance their combat power, and the primarch saw the wisdom of the idea. Most of the skitarii were assigned to the under-strength Dragoons, who were given the responsibility of defending the tramway and the grey zone. The Dark Angels were to be held back in a mobile reserve, to reinforce key areas or deal with unexpected enemy attacks. The Dragoons spent their days labouring over their fortifications and then sleeping in them, while the Astartes had been assigned temporary quarters in a number of empty warehouses inside the forge complex, close to the gateway. A trio of skitarii Praetorians had been assigned to each squad for added reinforcement.

Nemiel's Rhino drew up to the gateway and ground to a halt in a billowing cloud of dust. Civilian workers wiped sweat from their eyes and peered through the haze as the Redemptor disembarked and worked his way through the reinforced permacrete barriers that had been laid in an alternating pattern between the towering bastions. Dragoons and skitarii alike watched Nemiel from the battlements; his gaze searched among them, looking for the helmeted heads of his squad.

'Over here, brother!' Kohl shouted, waving his arm from the top of the southern bastion. Nemiel waved in reply and headed up to join him.

He found Kohl and Techmarine Askelon at the topmost level, supervising the installation of advanced ballistic calculators that would help the Dragoons call down effective artillery fire on the attacking rebels. A trio of fearsome-looking skitarii stood nearby, observing the proceedings with almost mechanical detachment.

'Come to check up on us, brother?' Kohl growled good-naturedly.

Nemiel looked over the crew of Dragoons and fretful tech-adepts installing the sensitive machinery and managed a grin. 'It's been too quiet lately. The primarch believes you're up to something.'

Kohl grunted. 'Always,' he said, completely deadpan. 'Tell him I'm touched by his concern.'

The Redemptor glanced over at the skitarii. 'How are the new squadmates?' he asked.

Kohl grimaced. 'Not much for conversation, other than that strange hash that Askelon insists is speech,' he said. 'Mostly they just stand around and stare at everything.'

'Has Magos Archoi got them billeted with you?'

'Oh, yes,' Kohl replied. His tone was mild, but the look in his eyes spoke volumes of his unhappiness about the situation. 'Second Company is spread out among three adjoining warehouses, about half a kilometre from here.'

Nemiel nodded thoughtfully. That was going to complicate things a little. 'Where's the rest of the squad right now?'

'Over at the north bastion,' Kohl replied, 'helping teach some new recruits how to work the heavy weapons. Why?'

'I'll be taking five of you back up into orbit with me in a few hours,' Nemiel replied, and raised a forestalling hand. 'Don't ask me why, because I don't know. The primarch has a job for us.'

'Well, that can't be good,' Kohl said with typical fatalism. He glanced over at the work party. 'We'll be done here a bit after nightfall. Is that soon enough?'

Nemiel glanced west, where the sun was already low over the distant ruins of Xanthus. 'Nightfall sounds just about right,' he said with a nod.

Three hours later, the Astartes climbed up the rear ramp of Nemiel's idling Rhino and found their seats along the narrow benches that lined both sides of the troop compartment. As the ramp clanged shut the armoured personnel carrier revved its petrochem engines and lurched into motion.

Brother-Sergeant Kohl had Techmarine Askelon, plus Marthes, Vardus and Ephrial. No sooner had the APC started moving than the squad leader turned to Nemiel and said, 'Now what's this nonsense about the primarch sending for us personally?'

Nemiel grimaced. 'I had to think of something halfway plausible to pull you out of there without the skitarii making anything of it,' he said. 'The primarch wants us to perform a reconnaissance mission inside the forge complex itself.'

As the Rhino worked its way slowly back down the access road towards the gateway, Nemiel produced the images that Jonson had given him and laid out the details of the mission. At the mention of the secret war machines, the attitude of the squad turned very serious indeed.

'We've got a lot of ground to cover in just a few hours,' Nemiel said at the conclusion of the briefing. 'Brother Askelon, what sort of threats are we likely to encounter?'

'There will be an array of electronic sensors covering each of the storage sites,' he replied, 'plus skitarii patrols with a full-spectrum auspex arrays. If these war machines are as valuable as the primarch believes them to be, they may be covered by additional security as well.'

Nemiel nodded. 'We can avoid the patrols,' he said confidently. 'Can you get us past the sensors?'

Brother Askelon considered the problem for several seconds before nodding. 'I can at least get us close enough to determine the contents of each building,' he said.

'All right,' Nemiel said with a nod. 'As soon as we're out of the Rhino, we go vox-silent; only verbal signals or hand signs. We can't risk having our transmissions detected. Questions?'

There were none. Nemiel rose from his bench with a curt nod and opened the Rhino's portside door. With a quick check up and down the dark access road, he jumped lightly from the vehicle. The five other Astartes followed suit, reflexively fanning out into a standard tactical formation as they moved quickly into the deeper shadows between two large warehouses.

Nemiel drew his bolt pistol, leaving his crozius aquilum attached to his belt. 'Let's try not to get into another fight with our allies,' he said quietly. Quiet chuckles rose from the darkness. 'Askelon, you've got point; I know it's not your usual position, but you'll spot the forge's security systems well before the rest of us. Brother Vardus, you're covering our back-trail. Everyone clear? Then let's get to work.'

They worked their way through the vast forge complex for hours, as Diamat's moon rose in a thin crescent and passed through a hazy, ochre sky. Now and again they would come upon a patrol of skitarii. These Tech-Guard weren't the massive, bionically enhanced killing machines of the Praetorians, but were simple soldiers akin to the Tanagran Dragoons, albeit in fine carapace armour and wielding high-power lasguns. Compact auspex units were mounted to the front of their helmets and flipped down over their faces like strange, insectoid masks. They moved with speed and skill, constantly alert and watchful, but the Astartes' enhanced senses allowed them to detect the patrols and find cover long before the skitarii were in a position to see them. Aside from the occasional patrols, the Astartes encountered no other signs of life.

There were hundreds of warehouses and storage depots located in the southern sector of the forge complex. Most were single-storey structures, but others were tall, cavernous buildings with massive, rolling doors that could hold entire companies of heavy battle tanks. Without the locations provided by Jonson there would have been no way that they could have completed their search in a single night; as it was, Nemiel had begun to fear that they would be working right up until dawn.