Raven Guard - Legion Organisation: The XIXth Legion was founded according to the Emperor's far-reaching vision for the armies of humanity laid out in the structure of the Officio Militaris. The Legion was divided into Chapters, Chapters into battalions, battalions into companies and companies into squads. Most Legionaries considered themselves members of a given company rather than a Chapter, the company being the preferred level for most independent operations. From the earliest formation, the Legion's officers devolved command responsibility towards the lower echelons, allowing sub-commanders to take the initiative and make tactical decisions according to immediate needs without interference from higher up the chain of command. This mindset was a direct result of the practices of the Xeric tribes, who conducted their wars against far more numerous foes and were therefore well-practiced in a wide spectrum of unconventional tactics. Individual units tended towards the smaller end of the scales and passed down by the architects of the Emperor's armies, but each was a tightly-knit band of warriors trained and equipped to operate on their own for extended periods. They were well able to live off of the land, taking what few resources they needed from their environment or when opportunity or necessity dictated, from defeated enemies.When the Legion expanded, its ranks were filled with the full panoply of war machines created for the Legiones Astartes. While its sub units remained relatively compact, the XIXth Legion integrated numerous smaller formations into its structure, allowing them to take its place in the hosts of the Great Crusade and to confront the countless enemies of Mankind that would deny the Emperor's manifest destiny to rule the stars. While retaining its expertise in stealth and infiltration, the XIXth Legion integrated formations of battle tanks, super-heavy war machines, artillery, assault vehicles and assets, mastering each with the skill engineered into them by the genius of the Emperor. Nonetheless, the XIXth Legion's favoured method of war focused on rapid strike, flanking, mobility and, where possible and desirable, stealth. Maintaining many specialised units, there were certain formations the XIXth Legion favoured over others. The Legion is noted in historical accounts as fielding more Legion Reconnaissance Squads than any others, every Legionary being cross-trained to fulfill his assigned role, as well as that of the reconnaissance units. Indeed, the line between Legion Tactical Squad and reconnaissance squad seems to have become blurred, the two often operating using similar tactics and even specialised equipment.From the earliest days, the Legion employed more Moritat than did many others. The individuals assigned to this duty were often those considered extreme in their methods even by the cold-blooded Xeric and they were often used -- willingly -- to undertake missions from which they were not expected to return. It is likely that the Raven Guard engaged in far more assassination and sabotage operations than is widely known to the Order of Remembrancers. Invariably, the increasing numbers of Remembrancers accompanying the Expeditionary Fleets were only allowed to bear witness to the Legion's victories after they had been won, the imagists, historians and poets were denied the opportunity to record the Raven Guard as they waged war on the Imperium's foes.In the aftermath of the Council of Nikaea, which history does not record Corax attending, the Raven Guard obeyed the command to cease the employment of Psykers and disband its Librarius. Many of the Legion's Librarians were reassigned to the line companies to serve in communication roles, although some may have served in the Legion Seeker Squads or as Vigilancers or Moritats. Whether or not these individuals obeyed the Decree of Nikaea where operating independently on missions not committed to any archive must remain unknown and it is likely that most were slain upon the bloody battleground of the Urgall Depression during the Drop Site Massacre on Istvaan V.