Author Topic: How big an Army do you need?  (Read 1080 times)

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Offline Polestar

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Re: How big an Army do you need?
« Reply #15 on: May 20, 2020, 05:47:31 AM »
I've had a fair amount of experience with conquering planets, including one defended by an army roughly 2 million in size on a forested rift valley world too cold for my species to live on, so I'll chime in with a few thoughts.

The size of the army you need depends most crucially on relative technology level. From fighting enemy ships, and possibly from a raid or two on an outpost or minor world, you should be able to make a decent guess about how this stacks up against your own. I'll throw out some estimates based on the assumption of equal tech, but having better armour than the enemy has guns will improve the situation drastically.

The second most important factor is planetary environment. You must always plan around this, because the size and composition of the hammer you need to wield will depend importantly on, for example, whether the temperature is too hot or cold for your species, or the presence of jungles or mountains.

Now, let's get to some estimates.
You see 10k enemy ground force signal on a flat, unforested world with a temperate climate.  First, multiply this value by your best guess about fortification level. This will range from x2-3 for mechanized units to x6 for infantry or static with construction equipment. I usually use a multiplier of 4. So, guess 40k-worth of opposition.

Now, multiply again by the greater difficulty of hitting fortified troops. We won't get into math better explained in a guide, so let's just multiply by 2 (same firepower, roughly 4x as hard to hit). So, a 10k signal means the equivalent of very roughly 80k in an even fight.

If you drop an equal-tech army at least 2x that, then provided you have an effective unit mix and you include enough supplies, you can ordinarily expect to win comfortably. So, that's a call for 160k troops to defeat a 10k enemy ground troop signal.

Now, consider a planet with unfavorable environmental conditions. It might be too cold or hot. It might have rift valleys or mountains. It might be covered in jungles or deserts, have low gravity, or even have a Venusian atmosphere. I use the following multipliers; other players will use somewhat different ones.
Too cold or hot: 1.5x, unless your units have the Extreme Climate capability. This condition is quite common - watch out for it.
Forested: 1.25x, and bring 1.5x-2x supplies.
Jungle: 1.33x, and bring 2-3x more supplies. If your army has jungle training, then the modifier drops to not much more than 1x, because enemy non-infantry units are much less effective here.
Mountain: 1.5x, and bring 1.5-2x more supplies. If your army has mountain training, then the modifier drops to 1x or a bit more.
Rift Valley: 1.25x, and bring 1.5x supplies. Same comments as with jungles and mountains on the great advantage of well-trained infantry.
Dense atmosphere: 1.5x, unless your units have the Extreme Pressure capability.


Finally, let's talk about tech. By the time I get around to invading other races, my tech tends to be quite a bit higher than theirs. For every tech level you have over the enemy, multiply the size of the army you need by (very roughly) two-thirds. This varies depending on how carefully you maximize your advantages in penetration, damage, armor, and hitpoints over the enemy.

That two million-size army I mentioned earlier? Using an only partially optimized force, I took it down pretty comfortably with a total drop of about the same size (including all supplies), because I had at least a three tech level advantage over the defenders.
« Last Edit: May 20, 2020, 06:03:20 AM by Polestar »
 
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Online vorpal+5

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Re: How big an Army do you need?
« Reply #16 on: May 20, 2020, 07:47:06 AM »
Would you like to post some of the OOB with tips or quirks you found?
 

Offline Vastrat

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Re: How big an Army do you need?
« Reply #17 on: May 21, 2020, 04:36:29 PM »
An Example OOB would go be very welcome. Also how much supply would you need for the invasion? Thanks.
 

Online Father Tim

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Re: How big an Army do you need?
« Reply #18 on: May 22, 2020, 09:07:07 PM »
"How big an Army do you need?"

A few thousand INF-PWL on each colony for unrest suppression, and an invasion force at least thirty (30) times the size of the defenders to conquer a planet.
 

Offline ydirbut

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Re: How big an Army do you need?
« Reply #19 on: May 22, 2020, 09:30:41 PM »
Apparently, fortified troops are obfuscated on your sensor readings.  So if it says there are 10,000 tons on a planet there are probably more than that. 

As for NPRs, I just invaded a (forested mountainous) NPR homeworld that had a 120,000 ton (sensor reading) ground force defending it.  I had a pretty significant tech edge (Heavy Power Armor against infantry and tanks with some PA) and I invaded with about 500,000 tons of combat troops (in two waves) with probably 250,000 tons of extra logistics troops. 

Honestly, running out of supplies was a huge issue for me because of how long the combat lasted.  I would heavily recommend using logistic vehicles instead of infantry just to make the micro easier on you.  I tried orbital bombardment with my gauss/missile fleet, but honestly I found it really ineffective and I wouldn't recommend building any FFD at all (I think it would be more effective with a laser fleet but I don't know).  Also, the combat lasted so long that it destroyed literally every building on the planet, so I guess maybe I should have destroyed it from orbit.

I used some super-heavy tanks against the NPRs and it seemed very difficult for the NPRs to damage them.  A cheesy tactic might be to drop a bunch of heavily armored tanks in your first wave and have them waste all of their supplies on them. 
 

Offline the obelisk

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Re: How big an Army do you need?
« Reply #20 on: May 23, 2020, 03:43:53 PM »
On the subject of ground combat against precursors, do they use aircraft?  Also, how might I go about dealing with their STO weapons?  Should I just shoot from orbit until I've gotten them, and write off the ruined installations?  Drop in a vanguard and hope they kill the weapons before I bring in the main force?
 

Offline DFNewb

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Re: How big an Army do you need?
« Reply #21 on: May 23, 2020, 04:30:30 PM »
Question for ground combat veterans:

When you land your troops, are they on defensive front by default? Will they not attack unless fired at in this stance? Does the NPR attack your landed units first?

I am wondering if you could land troops on a planet over a longer period of time and just defend until they are all there.
 

Offline Droll

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Re: How big an Army do you need?
« Reply #22 on: May 24, 2020, 11:57:10 AM »
Question for ground combat veterans:

When you land your troops, are they on defensive front by default? Will they not attack unless fired at in this stance? Does the NPR attack your landed units first?

I am wondering if you could land troops on a planet over a longer period of time and just defend until they are all there.

From what I understand defending troops will fire at units that are on attack mode and will not make pushes of their own - this is useful because units on the attack wont the fortified and allows you to start defensively while you establish your own foothold.

Attacking troops will pick a target and attack, attracting reaction fire from any defending formations.

Another thing I noticed is that the NPR ground forces are much more aggressive during the initial stages of your landing, this is mostly because your troops have not fortified yet. Once your construction vehicles have dug your guys in you might expect defending NPRs to back down on their aggression and start digging in themselves.
 
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