Open_Sketchbook wrote:Basically it seems to me that the tech in 40k sort of flips the Inverse Square law; the biggest something is, the more protected you can make it. This is probably because they don't hit diminishing returns on power generation until, like, capital ship size, so a larger vehicle, for example, has a disproportionately more powerful engine than a smaller version in excess to the exponential mass increase caused by it's greater dimensions, so a super-heavy tank can beat the normal dynamic of a vehicle's linearly increasing size multiplying it's mass by the fact that the greater internal volume allows for exponential power generation, thus allowing greater density of armour (as the engine will be powerful enough to move it) and increasingly esoteric and overpowered energy shielding and other active defense measures. However, this also means that complexity and manufacturing costs likewise increase even more than would be expected just in terms of scale, to the point where you could make a hundred times the mass of standard tanks than super-heavy tanks because the super-heavy requires forgotten or closely-guarded power generation systems to move it's massive bulk.
So we end up in a situation where, as you move up the scale, stuff gets both exponentially more dangerous and more expensive, and a large mobile system or a heavy fixed emplacement is essentially invulnerable to anything less powerful than itself. At the same time, such systems cannot be everywhere; just due to logistics you have an order of magnitude more infantry than tanks, more tanks than superheavy tanks, and more superheavy tanks than mobile fortresses and titans.
If we accept this dynamic is true for both sides of the conflict (which seems to be the case for humans, tyranids, and to a lesser degree eldar and orks) than it is pretty clear what is happening. It is very much a World War One situation where an emplaced weapon is simply vastly superior to it's mobile counterpart, meaning that once a piece of ground is taken and reinforced it will require a disproportionate amount of force to shift them, but disproportionate force is disproportionately rare for logistical reasons. Even after the tank was introduced, trenches remained because the tank could not be everywhere. A similar situation exists here; a planet in rebellion might have hundreds of thousands of soldiers armed with artillery, machine-guns, lascannons and a so forth, and less than a dozen tanks to their name, and the Imperial Guard who land to meet them will likewise probably be mostly infantry simply because few worlds can manufacture these technically-advanced vehicles and most of them have such excess of population that they will still raise vastly more infantry. It is not as though you could simply make cheaper tanks; if they tried to build tanks with more conventional power sources and materials in the style of modern vehicles, they would simply be ripped apart by infantry-scale weapons. Notice how the Imperial Guard will use local trucks, cars and half-tracks for utility purposes, but never, ever fields a tank unless it's a Russ. The tanks have to adhere to the exponential power gain for mass increase that characterizes 40k technology or they wouldn't survive.
So what we see over and over again is an Imperial Guard whose preferred tactic is to use mass tank tactics and shock attacks, but the logistical reality is they will always have more infantry than tanks and they cannot concentrate enough force to make a decisive attack with anything less than an overwhelming force of armour. So what happens is the inevitably infantry-dominated forces of the Imperial Guard are forced into positions where they must amass their vehicle forces to crush the enemy line in weak points and cause the enemy's defensive positions to become untenable before they attack, otherwise it is futile, but at the same time if they do not put some form of pressure on the enemy, they will simply increase the quality of their emplacements and keep their forces in reserve to defeat such a tactic. So the strategy ends up being to engage the enemy's infantry with your own and drag them into a quagmire; sometimes trench warfare, but also Stalingrad-like urban combat, deep jungle fighting, and other sorts of engagements where mobility is limited. They even engage in a form of it with mechanized regiments; the Steel Legion seemed to rely on a reactionary mobile defense rather than offense for much of the Armageddon War. The Imperial Guard's numerical advantage isn't used purely for attrition; rather, it lets them string the enemy out along long fronts and forces them to commit reserves to secure their endlessly increasing flanks or match the density of troops in an area, thus lining them up to be knocked down by the tanks. Hence the weapon-festooned design of the Imperial tanks; they are explicit linebreakers and are not designed to fight their own kind head-to-head because if you have to have a fair fight with a similar-scale foe you have already lost. Notice that all Imperial vehicles specialized for anti-tank work, like the Vanquisher and the Laser Tank Destroyer, are fielded in a highly defensive nature, and they have no mobility-based tank destroyer. The MTB as a concept is dead and gone in the year 40,000, because the MTB isn't as good a linebreaker as Russ-style infantry tanks and can't beat specialized defensive tank destroyers.
As wars get bigger and stakes get higher, the process gets recursive. If you are fighting an enemy who can field tanks and tank-scale fortifications in numbers enough to blunt the advantage of massed armour, using armour in this way becomes futile the same way infantry on the offensive becomes futile. So the Guard escalate; they spread their tank forces out to force the enemy to do the same, and they amass super-heavy armour which can break the line; regular-scale tanks are as helpless against super-heavies as infantry are against mass tank assaults. Likewise, they maintain a stable of defensive super-heavy vehicles and bastions to prevent the enemy from doing the same to them. Enemy have super-heavies and super-heavy fortifications? Spread your super-heavies out and escalate again: call the titan legions.
If I understood his idea, and I apologize if I do not, he is arguing the Guard use X doctrine because Y tech makes it advantagious. That is slow tempo attrition with mass waves of infantry/ heavy entrenchment works better with available technology than manuver warfare would. So to that end I want to look at doctrine in relation to the speculated tech predominatly in vacuum, obviously I realize there are a series of logistical issues besetting the IOM which effect doctrine but since that overly complicates and possibly obscures the matter, as well being incidential to what I sense is the main thrust of the argument, I'll be dealing with ideal/naked assumptions.
Now I am not a soldier just a loud mouth Civvie who wouldn't know his arse from an entrenchment shovel and talk of MRLs, PGMs, SPGs and the rest of the alphabet soup makes my brain hurt rather than illuminates but supposing my tech made defense A number one and attack a distant second would not it be advantagious to get in and hit my enemy before he can set up these elaborate defensive lines. Should not mobility be the king in such battles to bypass my stactic foe when possible and marshal overwhelming strenght when it isn't?
To me spreading out a man intensive entrenched line works against you since it drains and disperses your strenght across untold miles of front when units of fully mechanized infantry, all in Chimeras, supported by Russ tanks and basiliks, or some lighter more manuverable variant, with proper intel and scouting units could swing and "blunt" your enemy's push more effectively with less comitment. Conversely you could more easily marshal and deploy greater strength against any one point in your enemy's line effortlessly breaching it then, with your greater mobility, dictating the engagment with any of your enemy reserve forces.
Further would it not be effective to instead of employing mass infantry, which are bulky requiring relatively mammoth support, to focus on more highly trained/innovative soldiers to increase their effectivness allowing you to hit the same "strength" while being vastly easier to transport to and from battle? And thus easing your logistics concerning Chimeras and freeing space which could be used elsewhere such as that many more Krak missiles to keep your infantry "fanged" against armor pushes.
A push to better intergrate your airforce in supporting your armies tactically, ie flying artillery, and strageticly, destroying fuel refineries far in the enemy rear, would also be of benifite through I realize the IOM has cultural reasons for keeping air, and various other war components, organicly isolated.
In conclusion I would argue that against static high powered fortifications/units the best approach is not emulation but avoidance/outmanuvering by tacticaly flexible forces pressing the enemy faster than they react. Such thought, as I dimly grasp it, is what was birthed to deal with the quagmire of WWI which is what Open_Sketchbook, as he said, is essentially advocating in terms of doctrine. But like I said I'm a loud mouthed Civvie and I could be going about this all backwards.
I of course expect and welcome any thoughts on the matter. If I'm being all blinkered or overlooking some crucial point please feel free to drop it over my head.