Yuuzhun Vong Vs. Imperium

[Iosef Cross]

Connor made this point earlier and it was hardly refuted. His point was that most Hyperspace calculations were based on singular vessels of extraordinary designs.

From the main site:

http://www.stardestroyer.net/Empire/Tec ... sion2.html

This is supposed to be on usual travel times:



Tatooine to Corellia in 4 hours, a distance of ~25k light years:


Apparently, common SW starships can travel usually at the tens of millions c!

You assume the high end, regardless and then apply it to a race that have shown that they applied more of their abilities because the NR were idiots. In fact when the NR decided to apply the offensive, they trounced the organic wannbes.

The Vong were a quite powerful force in the SW galaxy, they managed to conquer a large proportion of the galaxy.

The NR was more powerful than them, but not by more than an order of magnitude, and the NR was in the same order of magnitude as the IoM. Even if the NR had pathetic coordination, the slow speeds of the IoM would be a much worse disadvantage.

So now, you also have the problem that you have simply assumed that 40K is at some arbitrary speed that you have deigned appropriate. In conclusion, you simply pressed submit with whatever delusions you could splatter on the screen.

Say to me, what are the speeds of the 40k universe? If they are below 10 million c, they are fucked.

If we cannot determine if the speeds of 40k are comparable or slower than SW speeds, we cannot say anything about the outcome of a conflict between the 40k powers and the Vong fleet. Since you people that think that Vong would get crushed by the IoM without calculating the difference between their speeds and SW speeds, your arguments are at most as good as mine.

[Iosef Cross]

Interesting.

The general consensus on this site seems to be that the Galactic Empire could kick the Tyranids' butts (superior strategic mobility and, arguably, firepower). And here people are saying that the Imperium would kick the Vong's butts.

So it sounds like either empire would handle the other universe's biowank army better than it handles its own. Strange.

It is not strange if you think about the fact that SDN people think that biowank is lame.

Hence, Tyranids are lame while GE is cool, so GE wins! Vong are lame while IoM is cool, so IoM wins!

That's a better predictor of the average opinion on these cases of technology versus biowank, instead of objective facts.

[Iosef Cross]

The Vong ships can still travel hundreds of thousands of light years and for SW, a BDZ is easy stuff. That's enough.

Because you can provide what ships the Vong have to commit to this military procedure. Here's a hint, the reason we know some Imperial and Trade Federation forces can do so are because we have examples of ship(s) doing so.

You need to demonstrate which Vong vessels have comparable speed and firepower given you're just pulling both from your ass.

Any SW power can do BDZ. You don't need to find specific examples, because it is clearly under the abilities of a power that could fight the entire SW galaxy for 4 years.

[Ghost Rider]

So he pulls up Mike's old chart, without actually trying any the new information and declare this must be fact for all vessels. Though I will give that Mike's points are relevant to the Rebel Fleet, but has nothing to do with the Vong. In fact it was noted the Vong's speeds were not always on par with the Imperial Renemant or the NR. But don't let that get in the way of manaical stupidity. So his declaration is that he wants that hyperspace will...work the same in 40K. Oh wait, doesn't SW make mention that their speeds are such because they have acknowledgement of specific ways of getting to places? They send out probes(which the Vong do not have) to explore the quickest paths?

As for the Vong conquering vast swaths of territory. It reads like much of his other material, in that there is no regard to circumstances or history. The NR bickered and essentially let the Vong conquer said territory. Oh wait...the IoM do not have this problem. Again a supposition made by fanboy whores that the enemy stands there, mouth agape.

And last but not least, he's yet to provide anything towards Vong performing BDZ operations with impunity given their ships are in disrepair at the start of the entire event and they are not against a foe that will bicker on what to do. Oh and don't forget, any power can BDZ even though the couple examples we have are from military operations and rather specific ships. Screw objective evidence...play from the gut.

But yes, objectively the Vong will win because he has demonstrated that their forces aren't in disrepair, against a for with comparable firepower, greater knowledge of the battlefield and finally aren't in a bickering mode brought on by people undermining them.

Oh and the other factions of the galaxy will accept the Vong as well.

[Iosef Cross]

The stupidity of the NR doesn't prove that the IoM would easily defeat the Vong because it was impossible that the Vong fleet was a order of magnitude bellow the NR in aggregate firepower, since to lose a fight from somebody of half of your weight is stupid, to lose from somebody the size of an ant is impossible. Also, if the Vong hyperdrive speeds cannot have been much slower than SW speeds, if they were the SW galaxy wouldn't have any problems defeating them.

You say that the NR let the Vong conquer these areas without resistance? That's it?

You basically say that an military organization like the Vong fleet was 1000 thousand times weaker than any other major SW faction, and that they only survived because the NR was stupid. You rest all your perception that the Vong would be easily dealt with in the IoM galaxy because the NR was stupid.

That's like claiming that a street gang could conquer Russia today because the Russian government is stupid.

Considering that the IoM couldn't be governed centrally. Their goverment had to be decentralized into sectors and systems. Their FTL speeds were much lower than SW's, where any ship can go from one side of the galaxy to the other in a day. And these lower speeds meant that IoM cannot survive agaisnt any SW power of the same order of magnitude as the GE, since SW powers can dictate the terms of any engagement. And apparently the Vong was in the same order of magnitude of the GE.

The decentralization of the IoM goverment (or more precisely, the unfeasibleness of centralized political administration in the 40k galaxy) implies that the IoM was not in the same order of magnitude of any major SW power. And that includes the Vong.

[Brother-Captain Gaius]

Connor has already demonstrated the problem with "B-b-b-but Star Wars ships are soooo much faster, therefore game over!!!"

Namely, that any SW force invading the Milky Way does not have any navigational information on its systems, its defenses, and its nuances of navigation. I am unsure how a lack of established hyperspace lanes would affect the Vong; did their infiltrators make use of existing NR infrastructure? There is also the matter of the Warp and warpstorms.

In any case, any Vong infiltration will have severe difficulty (at the very least) getting anything done on all but the most remote backwaters. The NR was ridiculously vulnerable to espionage and sabotage both in terms of counter-intelligence and its own political structure. The Imperium has neither of those problems; as I stated earlier in the thread, it is the sole purpose of the Ordo Xenos to exterminate the sneakier xenos and their human converts. Attempts to acquire navigational information, in the unlikely event they are successful, simply may not provide a very broad or very accurate picture given the feudal nature of the Imperium and the way knowledge and information just is not freely available the way it is in the democratic New Republic with its Holonet.

So how are the Vong going to get anywhere quickly, exactly? They are in an alien galaxy and know little to nothing of its defenders, layout, or quirks. You propose they are simply going to zip about the Imperium with complete impunity? How do they even know where the Imperium's major planets are? How do they know where their fleets are?

Of course, that segues into an additional complication: Backwaters, yeah, as I stated are probably going to fall. Once the Vong move past mere backwaters though, things get tricky. The Imperium takes notice and starts hitting back. Systems have their own defenses which can't simply be ignored through some hand-waving and mumbling about "speed". If the Vong use the backwaters they've taken to establish a foothold (which they are going to have to do at some point), then they are right smack-dab in the middle of the Imperium's inevitable counter-attacks (which tend to hit like sledgehammers).

Even if the Vong magically divine the precise layout, composition, and positions of Imperial fleets and defenses in order to perform equally-magical blitzkriegs of concentrated forces, it doesn't address the superior survivability of Imperial ships. The two sides' firepower may be on par with each other, but their toughness is not. The Vong are going to need numerical superiority just to break even in a single tactical engagement.

[Ghost Rider]

The stupidity of the NR doesn't prove that the IoM would easily defeat the Vong because it was impossible that the Vong fleet was a order of magnitude bellow the NR in aggregate firepower, since to lose a fight from somebody of half of your weight is stupid, to lose from somebody the size of an ant is impossible. Also, if the Vong hyperdrive speeds cannot have been much slower than SW speeds, if they were the SW galaxy wouldn't have any problems defeating them.

No, it doesn't prove the IoM will easily defeat them. It does prove the Vong will not have the significant advantage that they had with the NR you idiot. Also you are saying they cannot be much slower, but given they didn't immediately blitz the NR and such not must mean their speed is hindered by something. Could it be that hyperspace has and been shown to rely upon certain paths? Hell a common tactic was to actually mine said hyperspace lanes to intercept NR vessels. Something the Vong do not fucking have.

So yes, your vaunted they are orders of magnitude faster is put into question because they don't have the infrastructure available and they are against a foe that isn't going to wait.

You say that the NR let the Vong conquer these areas without resistance? That's it?

You basically say that an military organization like the Vong fleet was 1000 thousand times weaker than any other major SW faction, and that they only survived because the NR was stupid. You rest all your perception that the Vong would be easily dealt with in the IoM galaxy because the NR was stupid.

Given you didn't read the material you really do not grasp the truth of the matter. Until they were at the corners of the Core systems there was no significant resistence. So yes, they were confounded by politics and inaction. When they gathered their forces together they made significant inroads, but not beforehand.

If you cannot grasp this, you're the one that needs to demonstrate evidence from NJO that they were not being inept and there is another logical reason that the Vong made their presence felt.

That's like claiming that a street gang could conquer Russia today because the Russian government is stupid.

So you're equating the Vong to a street gang? And also why. At no time have you demonstrated their fleet strength, and you are the one presenting that they will someone crush the IoM with massive BDZ assaults AND superior forces. Both need some very large point of proof to be put forward.

So show everyone that the Vong have the forces to do these actions.

Considering that the IoM couldn't be governed centrally. Their goverment had to be decentralized into sectors and systems. Their FTL speeds were much lower than SW's, where any ship can go from one side of the galaxy to the other in a day. And these lower speeds meant that IoM cannot survive agaisnt any SW power of the same order of magnitude as the GE, since SW powers can dictate the terms of any engagement. And apparently the Vong was in the same order of magnitude of the GE.

The decentralization of the IoM goverment (or more precisely, the unfeasibleness of centralized political administration in the 40k galaxy) implies that the IoM was not in the same order of magnitude of any major SW power. And that includes the Vong.

Again, your onus to prove that Vong have these forces. You've just been yabbering about SW on a level you have no clue for, and then contending that they must be powerful enough to defeat the IoM by proxy that the GE could go toe to toe with said forces.

You haven't demonstrated how or why in any shape or form.

[Night_stalker]

Just leave the poor troll alone, you can't argue with fanasticism.

[Serafina]

Just leave the poor troll alone, you can't argue with fanasticism.

No, but you can mock it.

Either way, Iosef Cross - proove your assertions about the Vong. And NOT by using NT or GE-numbers.

Show us
-their initial fleet strenght (just an order of magnitude at least)
-their FTL-speeds (they FTL is different than other SW-drives)
-their FTL-communications, if any
-their production speeds once they have conquered some planets

Here is a Star Wars wiki for you, now go and give us some numbers.

Can't do that?
Then i am afraid that your assertion that they will just curb-stomp the IoM is just plain wrong.

By the way, most battles during the first year of the invasion that give us numbers list only single capital ships.
The LARGEST battle lists "hundreds of capital ships". Let's be generous and assume that that means "900 capital" ships.
(the opposing fleet was 300 capships strong, so that would be a more sensible number).
That is certainly enough to overrun most IoM-worlds, with the exception of larger ones (you have to keep in mind that a YV-capship merely equals an light IoM-frigate).
But it's a far cry from being able to run around and BDZing dozens or hundreds of worlds.

Now let's assume that they try your stupid strategy anyway, despite their desperate need for resources.#
Let's assume that they split their ships into ten fleets and then jump to random worlds (since they lack any information whatsoever - no one in the IoM could given them navigational data that is not based on the warp anyway).
Every fleet that hit's a world that is not an imperial, clerical, forge, garrision or naval world will propably get away with minor casualties (say, 1 ship from the inital salvo of the defenders).
But if they run into any other world, they will get crushed by the defenses? I also assume that they can go to one world each day, for simplicity of calculation.

So how long can they keep that up?
Let's assume that only one in ten worlds falls into the "well defended" category.
Out of the inital ten fleets, one will get destroyed outright since they jumped to a defended world.
(The formula is: Number of remaining ships x 90% (because one fleet in ten is lost, ten percent of all ships) - 1% of all ships. 100 ships destroy 1 IoM world each, but 100 ships don't count since they hit the wrong world)
On day two, you will be left with an average of: 800x0.9-8 IoM-worlds lost: 7
Day three: 712x0.9-7 IoM-worlds lost: 6
Day four: 634x0.9-6 IoM-worlds lost: 5
Day five: 564x0.9-5 IoM-worlds lost: 4
Day five: 503x0.9-5 IoM-worlds lost: 4
Day six: 448x0.9-4 IoM-worlds lost: 3
Day six: 398x0.9-3 IoM-worlds lost: 2
Day seven: 356x0.9-3 IoM-worlds lost: 2
Day eight: 349x0.9-3 IoM-worlds lost: 2
Day nine: 309, 2 lost worlds
Day ten: 277, 1 lost world________________________ destoyed worlds total: 8+7+6+5+4+4+3+2+2+2+1=44

There you have it: A very rough and quite generous calculation of the damge done by your moronic strategy. After ten days, the YV-fleet is reduced to less than 300 ships and has destroyed a fourtyfour worlds, none of any significance

You can, of course, redo your strategy and try to attack with one giant fleet. While that will reduce your casualties, you will also be much slower and will eventually face a fleet that waits for you and crushes your small ships like bugs.
I'll let you propose calculations for that.

Edit:
If you wonder why that calculation is generous, i made the following assumptions in your favor:
-that you actually have 900 ships - 3-400 would propably more accurate
-that only one in ten worlds has the necessary defenses to stop your small assaults, which is most likely highly inaccurate.
-that you only need one day for each assault - but then again, that doesn't change the calculation directly
-that you don't run into any uninhabitated or non-imperial worlds
-that your fleet can sustain such an operation.

[lance]

Just leave the poor troll alone, you can't argue with fanasticism.

So how long can they keep that up?
Let's assume that only one in ten worlds falls into the "well defended" category.
Out of the inital ten fleets, one will get destroyed outright since they jumped to a defended world.

Can't the vong scout with fighters or simply leave and proceed to target two if they run into a sizeable force? Not saying they won't take casualties but it would be better than loosing the entire fleet.

Any how, the vongs main path to victory would be to establish as large of base as possible, few back water worlds here, a couple planets cut off from the warp there and what have you. I don't know a thing about their production so I don't know what they require. Then going with speed blitz. Which probably won't work due to important planets being defended.

Kind of like if Mexico invaded and took huge swaths of baren desert America wouldn't be as hurt if somebody took its 10 biggest cities.



Does anybody know the state of the vong fleet in the current RPG series? I think its about 1 thousand years after yavin, and they only have 1 planet as a resource base. So that would give an idea of needed planet base.

[Serafina]

Of course there are other strategies, but that's the strategy moronboy (hmm, i need more creative insults - how about Vonker ?[Wanker+Vong]) suggested. It fails.

Furthermore, you actually can't scout for lot's of defenses - namely, ground-based defenses. Which are capable of threatining 12km-long battleships - buh-bye Vong.


Anyway, i must challenge our little Vonker to to show that the Vong even USE BDZs.
Mostly becaused they used stupid tactics like "let's put an giant organism on a planet that then drags the moon onto the planet over several weeks". Certainly enough to achieve a BDZ, but why bother if you can just do it with a single ship?

And if the Vong have to fight on the ground, they will get buttraped by the IoM even on much smaller worlds.

[Night_stalker]

The Vong need the biomass planets offer, so a BDZ would be useless for replenishing their numbers. Plus, if they enter in the wrong sector, like say near Cadia, they won't even have time to transmit a surrender request before the Emperor's navy opens up with everything they have there.

[lance]

Of course there are other strategies, but that's the strategy moronboy (hmm, i need more creative insults - how about Vonker ?[Wanker+Vong]) suggested. It fails.

Its not a bad idea, as long as the difference in power isn't as high as it seems to be. Though if they can get a sizeable base in an area that is cut off from the warp then they might be able to pull this off. Lets say 1 cap ship per planet per year and if they can get a 100 planets, then after 10 years then that's, not a lot of ships. Maybe if they wait until the 666th crusade from chaos happens and kill steal.

So the vong don't have the initial resources, and we don't know enough about their ship building and other industry. If somebody can give the current vong fleet then that would help give an upper limit of what they can do. They only have one planet, but I think its magical so that screws with things.

Furthermore, you actually can't scout for lot's of defenses - namely, ground-based defenses. Which are capable of threatining 12km-long battleships - buh-bye Vong.

That would be an issue, but vongs defenses are based on black holes to block X number of shots so they might come off better than other ships with other type of defenses in that scenario.

And even if they do send a fleet their, the fleet can retreat once it becomes clear that this is a defended world. Maybe loosing fifth, or tenth, of the fleet, instead of the whole thing.

Anyway, i must challenge our little Vonker to to show that the Vong even USE BDZs.

Meh, its with in their capacity so we can't discount it.

Mostly becaused they used stupid tactics like "let's put an giant organism on a planet that then drags the moon onto the planet over several weeks". Certainly enough to achieve a BDZ, but why bother if you can just do it with a single ship?

That was before open, I think, combat so that might be an issue.

And if the Vong have to fight on the ground, they will get buttraped by the IoM even on much smaller worlds.

Yeah, they would need to blast the crap out of the planet first, and hopefully kill most of the defenders that way.

[lance]

The Vong need the biomass planets offer, so a BDZ would be useless for replenishing their numbers. Plus, if they enter in the wrong sector, like say near Cadia, they won't even have time to transmit a surrender request before the Emperor's navy opens up with everything they have there.

They don't have to do a full on BDZ(I think), they can do some really heavy pounding on rim worlds and maybe some mop up.

As for defenses like cadia, won't this be more visible to scout ships? Jump in on edge, see huge ass fleet, leave.
Does any body recall weapon ranges of the two from previous versus? That would be an important piece of info, vong ranges were comparable to the NR/Remnants so that could give them an advantage.

[Rye]

Meh, its with in their capacity so we can't discount it.

You can if it's never actually used. I mean, hey, it's "within the capacity" of the IoM to kill the Emperor and let him ascend to godhood and obliterate the chaos gods, uplift humanity and then warp-storm every xeno problem away. Potentially. It's not a realistic scenario based on their observed behaviour though, is it? So it'd be silly to treat it like a real application of the characters and settings involved.

Yeah, they would need to blast the crap out of the planet first, and hopefully kill most of the defenders that way.

Do they do that, though?

[Serafina]

Meh, its with in their capacity so we can't discount it.

True. You might even explain the fact that they never use a conventional BDZ with their strategic needs - much like you would do with the Rebel Alliance.

However, we have seen them doing BDZ, with a method that is highly impractical - placing a lifeform on the planet (which requires defenses) which then pulls an orbiting moon (which needs a moon) onto the planet - over a course of weeks (which leads to the question why they just don't use a ship).
You could argue that this is a great tactic if you want to be sneaky - but it is totally unusable against any IoM-world.
Furthermore, we never see a normal BDZ despite their willingness to destroy worlds - so it might be possible that they are either incapable or unwilling to do it.

[Night_stalker]

Exactly, and plus regarding them arriving in Cadia they may think that we are weak, and will easily fall before their might.

[Shroom Man 777]

That is a stupid method of killing a planet. I'd rather have Chewbacca die of old age than that.

[Serafina]

That is a stupid method of killing a planet. I'd rather have Chewbacca die of old age than that.

My point exactly.
Why do they have to resort to such an imbecilic method, if not because they are incapable of doing it otherwise?

Unless someone can answer that with either good evicende or a good reason, i think it is fair to say that the Vong are not capable (or willing) of classic BDZs.

[Connor MacLeod]

From the main site:

http://www.stardestroyer.net/Empire/Tec ... sion2.html

This is supposed to be on usual travel times:



Tatooine to Corellia in 4 hours, a distance of ~25k light years:


Apparently, common SW starships can travel usually at the tens of millions c!

I like how you claim "refutation" yet your own evidence actually indicates hyperdrive speeds can be variable (a point Mike actually made, but then Mike's never ever tried to establish one particular speed or speed range as a standard. He's just showing what they are obviously capable of, since all that matters is that the capability exists. I have never ONCE said that the capability does not exist, either. ) Oh and I LOL at anyone who tries to pass the Falcon off as a reliable, unmodified, or civilian starship.

Moreover I know other examples of "slower" speeds exist, like in the BFC (something about certain kinds of Interdictors, at least in certain areas of space, not being able to cross 91 LY in 4 hours.) Again, SW speeds can be highly variable depending on a variety of factors (including "speed may not be the only desirable trait one goes for). And how it applies in non SW settings is one of those "We don't know right off the bat" things. other than "at some point they probably could replicate most or all of the conditions in SW and thus gain their potential speed".

Besides, precision and reliability are as big, probably bigger factors than just pure speed. The ability ot micro jump and emerge closer to planets, the freedom from warp-based warp currents or storms (cases where it may or may not leak out into realspace are another story, of course.) and so on.

[Connor MacLeod]

To my knowledge the Vong will use mass extinction events if needed, but the most obvious means I recall seeing were either kinetic impactors (Vector Prime) or bioweapons (Tynna in the eAGents of Chaos series, against Ithor, etc.) They probably could BDZ if they chose though. Given how they prefer conquest I doubt they would use much of any WMDs easily.

The biggest problem with the Vong is that the methods they used against the NR in the NJO series won't neccesarily work here. They used decades of infiltration to pave the way for their force and destabilize things. Except that there's no really good way to easily or permanantly destablize the 40K galaxy (partly because its already destabilized, but partly because much of it is also decentralized - cf Genestealer infiltration) It would take far more effort to achieve the same effects.

The most they can do is maybe start mapping and scouting and laying out the "vector prime" angle and potential resource bases. The biggest weakness the Vong had was that they were coming in at the end of a long voyage. Their worldships were mostly worn out, their resources expended, and they had virtually no infrastructure. They were vulnerable (such as to the Empire ) easy crushing if they met resistance before they got established.

FTL speed suffers from some of the same limitations as the Empire - they need nav data, Random 40K anomalies represent random and unpredictable dangers (may be signficant or may be minor.), etc. I wouldn't just assume because SW has potentially high speeds the Vong do either (as I said "high speed" isnt necesarily always desired or even an optimal trait. For all we know NR vessels went with reliability, or endurance, or even compactness or low cost rather than high performance.) They do gain the advantages of reliability and generally precision, though.

Their comms have some advnatages (long range, portability, immune to detection) but aren't as versatile (they can only communicate among a fixed number of "linked" villips, as I recall. Most often only two. Two different villips can not communicate.) so it can be a bit cumbersome coordinating in large scales (probably why they use the bloody yammosk)

Industry wise, if they get set up (and they can ste up pretty fast at least.. they built another worldship pretty quickly IIRC at thed estroyed Sernpidal) they might be able to grow and expand rapidly. They don't need JUST biomass (as I recall they used Sernpidal as a shipyard and a staging area for much of the war.)

Offensively and defensively.. they are weaker than SW equivalents. The main reason they tended to match or beat SW ships is because they basically cheated (the dovin basals stealing shields, the difficulty in targeting, use of kinetic weapons and cheap tricks, etc.) Likewise they relied on Dovin Basal magic to protect them (their hulls are fricking coral for crying out loud) and probably the same magic forcefield wank that Vonduun crab armor used.

Having them come in from the north close to the EoT is retarded though. They're just begging for trouble that way, since its perhaps in the area of one of the most heavily-defended parts of the Imperium (IE near the eye of terror.) Its doubtful they could actually gain and hold territory without getting detected (And even if they do, they're at risk from both the Imperium and Chaos raiding.) Especially since they'd have to come in above or below the galactic plane. If they were smarter they'd be out on the eastern fringe beyond the reach of the Astronomican.

For the most part, they're basically sadomasochistic Tyranids with more religious overtones and fewer numbers and the need to hold territory.

[Night_stalker]

Hey, they're Xenos, and the Imperium will prevail as it has always done.

[Serafina]

Hey, they're Xenos, and the Imperium will prevail as it has always done.

Well, that IS a stupid answer, even tough you are mostly correct

Saying "the heroes always win" is not rational debate, unless there is an in-universe reason why this is the case (a karma-like field or divine intervention).
In any actual debate, you have to show why they win.

[Night_stalker]

Well, let's see:

1. the IOM has a estimated 1,000 SM Chapters, each at about 1,000 Astartes each! That is 1 million Astartes that could be diverted to deal with any threat.

2. There are unknown numbers, but estimated to be billions or even a trillion Guardsmen, not even counting the PDFs and Arbites of the Imperium.

3. Add in the Imperial Navy and Inquisitorial forces, plus all the private soliders, and that's a lot of humans against the YV

[Brother-Captain Gaius]

Well, let's see:

1. the IOM has a estimated 1,000 SM Chapters, each at about 1,000 Astartes each! That is 1 million Astartes that could be diverted to deal with any threat.

No. No.

No.

Just stop. Stop what it is that you are doing.

For one thing, Astartes tend to have a mind of their own and do whatever they think needs doing. Very few people can "divert" them anywhere, and even then they are lucky to get a company or two, not an entire damned Chapter.

Secondly, a good portion of those Astartes are either busy doing Astartes thing, or held in reserve to replace front-line losses or respond to the Umpteenth Black Crusade and Hive Fleet Ginormous. They don't get their feathers ruffled over Annoying Xeno Species 4374.

2. There are unknown numbers, but estimated to be billions or even a trillion Guardsmen, not even counting the PDFs and Arbites of the Imperium.

Very few of which are even available and have the strategic mobility to deal with nuisances.

3. Add in the Imperial Navy and Inquisitorial forces, plus all the private soliders, and that's a lot of humans against the YV

Like the Space Marines, only a tiny fraction of those can actually be brought to bear in this scenario.

So stop. Seriously.