Also, i hope you are going to post here the full piece! i'd love to read that!
Well this is what i have got so far, mindful it has not been proof read and refined yet
The Road to War
The Imperium of Mankind is vast, comprising over a million planets scattered the length and breadth of the galaxy. It is the greatest empire in human history, but for all the worlds its armies and battlefleets conquered and the countless xenos races it has cast into oblivion, the terrible truth few men are privy to is that the imperium’s millennia long battle for survival may be failing. For the galaxy is a dark and terrible place and, beset by external wars and internal divisions, Mankind’s existence hangs on a knife edge.
In ignorance the wider military might of the Imperium battles on, in part because it knows no alternative, but also because the forces at its disposal are legion. From the colossal firepower of the Titans of the Adeptus Mechanicus to the formidable Space Marines, the elite warriors of the Adeptus Astartes, there is little that can oppose its fearsome gods of war. However the effective they are though, their numbers are limited and it is ultimately upon the common man that the burden of war must fall the heaviest; those of the Hammer of the Emperor – the Imperial Guard
Consisting of billions of men and millions of fighting vehicles, the Imperial Guard is deployed to warzones and garrisons across the galaxy. At any one time its regiments may be engaged in thousands, maybe even tens of thousands of conflicts, and each and every guardsmen requires a constant supply of food and water, weapons and ammunition, and a myriad of other equipment to survive. To manage this logistical nightmare the Departmento Munitorum was created and for millennia it has overseen the supply of men and war materials to the Imperium’s largest armed force. This has always been a vast and complex task, but when the Imperial guard is mustered en masse to counter an enemy that poses a threat to the Imperium at large such as a Hive Fleet, the duties it must perform to ensure the smooth functioning of the Emperor’s armies grow to epic proportions.
The Rise of the Threat without
The Damocles Gulf Crusade was the first military conflict fought between the Imperium of Man and the rapidly expanding Tau Empire towards the end of the 41st Millenium the Lithesh Sector of the Ultima Segmentum in the galaxy's Eastern Fringes. The conflict essentially ended in a stalemate in late 745.M41, as the Imperium was forced to conclude its military offensive early to deal with the encroaching Tyranid threat while the Tau sought to begin diplomatic negotiations with the Imperium to show humanity the benefits to be had by accepting the Greater Good.
Members of the Tau Water Caste had established trade agreements with Imperial worlds on the frontier of the Tau Empire, near the Damocles Gulf region of the Ultima Segmentum in the galactic east, and exchanges of goods and technology were common. Alarmed by the threat of alien contamination, the Administratum readied a suitable response and almost a century later, the Damocles Crusade smashed into Tau space, destroying several outlying settlements and pushing deep into the Tau Empire. When the Imperial fleet reached the Tau Sept world of Dal'yth Prime, however, the Crusade ground to a bloody stalemate as the formidable numbers and high technology of the Tau and their Kroot allies thwarted every attempt to capture the world or its star system. Many months of terrible fighting ensued with nothing gained on either side. By late 745.M41 the Crusade's commanders eventually agreed to requests from the Tau Water Caste for peace talks. The negotiations were successful and the Imperial fleet withdrew from Tau space unmolested, primarily due to the impending approach of the Tyranid Hive Fleet Behemoth.
Searching for a cure
Preparations to counter this new rising power on the eastern fringe would directly affect nearly every part of the Ultima Segmentum and would expand far into the heart of the Imperium, whether it was demands for new Imperial Guard regiments from its many tithed worlds or increased production quotas placed upon forge worlds to meet supply demands. Since the end of the Damocles crusade Alexei de'Ossmann an Inquisitor Lord of the Ordo Xenos had immediately set about trawling through classified records for a as of yet untapped solution to the xenos disease.
It was during this process of evaluation and cross-referencing that the planet Pavuvu came to Alexei’s attention. A small abandoned imperial world deep in the Ultima Segmentum, early audits of the planet had shown it as pretty unremarkable save for a few things: first the ferocious weather, secondly, its close proximity to the Farsight Enclaves and lastly, an unknown energy source that can be detected on the planet but had never been located. Alexei de’Ossmann believed this to be the Magma-core syphon an ancient artefact capable to powering the Warp-Matter collider; a weapon so powerful that it is capable of obliterating entire solar systems. Alexei had known about the weapon for some time but with no way of powering it, it was locked away for safety reasons in a classified location. If he Alexei could obtain the Magma-core syphon the weapon could finally be used to destroy the enemies of the Imperium.
Armed with this information from ancient audits across millenniums by officials, Alexei quickly hastened an assessment squad and dispatched to the region. Led by himself the mission was simple, ground survey the planet from space for possible locations for the artefact and if safe to do so land men on the ground to retrieve it. If it was unable to be retrieved Alexei would report directly to the Master of the Departmento Munitorum’s office to demand military assistance in conducting his operation. Alexei de’Ossmann would use any means necessary to achieve his mission and if someone could not, or would not help they would be replaced by someone who could.
There we go