@Durin Omake!
Artillery Duet
For those on the ground one of the true constants over the past fortnight since the siege of Mar Sara started in earnest was the pounding of artillery. The rolling thunder of distant explosion played a counterpoint to every facet of life, from sleep to combat, and few days went by anywhere on the surface without the scream of incoming munitions falling from the sky or the earth-shaking blast of too-close detonations, let alone the sharp yet muted retort of counter battery fire.
For all that it was a constant, though, to those who could afford to truly pay attention it was ever changing, telling the story of the battles even as they occurred. Imperfectly, of course—as a medium the sounds of artillery are far too granular and limited to convey the full depths of the myriad struggles that made up even the skirmishes of this war—and fading away far too quickly with time and distance to be of much use, but to the discerning ear each thrust and counter thrust was briefly immortalized.
Those familiar with the tendencies of Orks might assume that their use of artillery would be random. They were right, too, as the Orks cared little for concepts such as grand strategy, complex tactics, or discipline, but there were patterns and information there nonetheless. A single round fired would be followed by a smattering of copy cats, each either inspired by the explosion of the first, seeking to outdo it, or both. A barrage suddenly petering out as those firing it began to quarrel over whose turn it was to shoot the gun, briefly pausing as they stop to admire a particularly great explosion, or even intensifying as a spontaneous competition between the gunners forms. Random, certainly, as synchronizing their shots, using premade firing solutions, or even time-on-target are all beyond them, but not without their own underlying logic and information.
The human artillery usage was both much less random and much more varied. An interesting contradiction, to be sure, but not exactly an unexpected one. Despite their superficial differences, at a fundamental level all Orks are the same, while despite human's superficial similarities all are different. The collection of humans gathered together to defend this world from the Ork menace hailed from many worlds and backgrounds, and their usage of the weapons of war reflected it.
The Midgardians made up the bulk of the forces, but even if they hadn't their style would be considered the baseline against which to compare all others. Ordered, dutiful, and methodical described everything from their loading to their firing solutions. Each spread of ordinance largely the same, as war was not the time for improvisation and by doing the bulk of their preparation ahead of time they could increase the rate at which they could fire. Quantity had a quality all of its own, after all, and their armed forces sought to balance the quality of their troops with sheer quantity. A man with a copy of their tactical manuals might not be able to figure out their exact circumstances based on their choices, but he would be close.
The Alfheimers were rare amongst the gathered troops. With cause—for all that they had exerted no small effort to bring themselves up to the standards of the rest of the Trust, they were not quite there yet. Few could find fault with it, though, as their issues lay in their circumstances rather than their own efforts, and they aid they brought was appreciated. Their firing, though, could be best described as aping the Midgardians and falling short. Nothing serious, but rather than a unified retort as the big guns fired occasionally the volley would be a touch ragged, and their firing solutions a hair slower and slightly less optimal.
Then there were the Mechanicus forces, working together in silence occasionally broken by a squawk of binary. Mechanical in precision, mechanical in movement, mechanical in body, each and every movement in their dance carefully optimized with all extraneous action stripped away. Firing solutions mathematically derived to cause maximum damage, yet no less idiosyncratic than their less logic-driven counterparts.
Of particular note were the Avernites, few in number yet disproportionate in effect. Of all the human forces represented their artillery seemed the most random, yet none would argue that they were anything but the most deadly on a per-battery basis. Every firing pattern tweaked to better suit the circumstances, every move analyzed for potential improvement, every action taken to better eliminate their enemy. War was in many ways their home every bit as much as Avernus was, and it showed in their near casual familiarity with it. Preparation occurred simultaneously with action, and each individual moved with steady confidence both in themselves and their comrades regardless of the circumstances, as most feared failing them far more than death.
The situation was not static, far from it, and the duet of the artillery was ever twisting to reflect the changing circumstances. Batteries fell silent, new ones joined in. Orbital strikes played a counterpoint, first with the Orks and then later with the human defenders. And through it all those participating listened.