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[Secilian Federation]

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[Zinhu]

The doctrine for the Zinhu defence forces in such a scenario is to oppose the invaders through both conventional and unconventional means. The first step would be a general mobilisation of the armed forces. Which includes calling up reservists to bring the Army to it's total strength of 52,300 men and bring all conventional army units up to full strength. The goal of the conventional forces is not necessarily to defeat the enemy, but to inflict as many casualties as possible on hostile forces before the units' eventual destruction. Surviving members of the conventional units are expected to disperse and link up with militia forces nearby following the defeat of their units. They are required to engage the enemy conventionally to slow down the enemy advance to the capital, so proper defences can be prepared.

The capital is defended by the Presidential Guards Brigade, the Mechanised "Tigers" Brigade and a Brigade-level formation of the Party Militia. The capital will likely to be where the stiffest resistance from the Zinhu Armed Forces will come from. However, like other conventional forces, they are not expected to win, but to inflict maximum casualties on hostile forces.

The Party Militia, organised into battalion-sized units, is not to engage the enemy directly, but instead harass the enemy through unconventional means. However military district commanders may call upon them to bolster Regular Army brigades and battalions if necessary to resist the enemy.

Special Forces units are tasked with operations in the enemy rear area, primarily to disrupt lines of communication and weaken enemy morale, through roadside bombs, suicide bombings, sniper attacks, ambushes and the like. They are also to coordinate with militia forces for the purposes of unconventional warfare.

As it is impossible for Zinhu to hold the capital and maintain a functional government in the event of such a scenario, the Government will not remain in the capital, but instead disperse around the nation. The President will flee to his tribal home.

Following the conventional (and, hopefully very costly for the enemy) defeat of the Zinhu military, an protracted, unconventional war is to be waged against the occupying forces. One of the first tasks of loyalists to the Government would be the enactment of a scorched earth style policy. Industrial and economic centers, such as mines, oil rigs, factories and the like will be attacked and destroyed, in addition, civilian infrastructure will be targeted, roads will be destroyed, power lines will be attacked, humanitarian delivery disrupted etc. The campaign is intended to increase the suffering of the Zinhuan people and drive more towards resisting the occupiers.

These attacks will be carried out in false flag fashion, with the damage blamed upon the occupiers in an attempt to bolster support and manpower available to the old Government. Another terror campaign, carried out openly, will target occupying forces and collaborators. Any Government established by the occupiers will have it's members targeted for assassination. Checkpoints will be attacked, supply points raided, patrols ambushed and the like.

It's at this point that Zinhu will use it's chemical weapons, mostly for the effect it will have on enemy morale. Zinhu's chemical arsenal is largely confined to mortar bombs, MRL rockets and artillery shells with Sarin and Mustard gas warheads.

The strategy is intended to cause high manpower & fiscal losses for the occupying (and presumably western) force. Which will hopefully drive public opinion in the occupying forces' nation against the war, and is eventually intended to cause them to withdraw, at which time the old regime, if the leadership survives of course, will reestablish itself in power.

[Celistiant]

“They are in front of us, behind us, and we are flanked on both sides by an enemy that outnumbers us 29:1. They can’t get away from us now!”

[The Intergalactic Universe Corporation]

We will deploy our robot drones that amount to 3 times our population to fight in invaders

[The Srasain Forests]

The Srasain Forests are a militaristic tribal proto-country in a rainforest. When attacked before, we have waged total guerilla war on our attackers. And we would do the same. With spears, swords and shields, we shall defend our homeland and our forest. Even if it takes every Kechaat to do so, we shall defeat these invaders.

[Gunuztep]

Firstly, we would deploy the republican guard to the capital and all available forces to here. We would channel all air power to here, taking control of the capital and fortifying it. We would attempt an attack with our armoured divisions before digging in around the capital and calling a national draft. We would possible deploy some chemical weapons, though we have very few. The new recruits would be given sufficient enough training and sent to the front immediately. We would try to force a stalemate, whilst trying to get aid from outside to help us defend our nation.

If this failed, we would fight to the last, but would likely not pursue guerilla warfare if defeated utterly.

[Nortainland]

We would call up every able-bodied male that has served in His Majesty's Armed Forces. They would be issued weapons from the parish stores. Non-essential residents in attacked areas will be evacuated to remote Hambrian villages. If all else fails, we will surrender.

[Skyhooked]

Let's say, most of our folk owns guns, so they will just stand up at moment's notice, and flush away any oppressive power.

[Multiversal Venn-Copard]

In a full-scale invasion across our entire territory (the various "backwater" multiverse clusters we control parts of, plus R0-0 where a large number of our occupied universes, including the most important ones, are), the very first step would be to determine how the attack is being carried out, so as to develop an effective counter.

If the enemy spreads out and tries to hit every territory at once, we take the opportunity to pull out, letting local Injection Craft stall them for a while and setting up the scenario below.

If the enemy centralizes their forces and goes for an attack on universes within R0-0 directly, the first hazard they'll have to deal with is the fact that everybody else is watching this. There's a lot of other multiversal nations in our home cluster, and many of them are allied or nearly allied with us. Therefore, our forces are immediately bolstered by those of the Aziphan, On Od Erra, and countless smaller civilizations. This also might include the Yunat, if they deem themselves to be threatened; and since they're very nearly as powerful as us, they would certainly provide a useful advantage.

Spacecraft in other universes or multiverse clusters can be recalled to core universes very easily, so we wouldn't be at (as much of) a numerical disadvantage for long. Platforms activate in the meantime, and are used in precision strikes to wipe away large concentrations of enemies. R0-0-0 is defended above all else, but we don't make it seem that way until a very large opposing force actually arrives there. Between the Trans-Dimensional Sleeper Platforms, the Weaponized Mathematical Platforms, and the emergency evacuation system built into R0-0-0, it would be extremely hard to wipe us out completely in an invasion.

[Appalatchia]

some are also away in other countries.

This would not be the case. Appalachia maintains a defense-based force and a non-interventionist foreign policy, so our troops would not be deployed abroad in any significant amount.

In the case of a large scale invasion, we would deploy our military to set up defenses around key sites and evacuate government leaders to secret locations. We would also contact our allies and trading partners, some of whom would certainly rush to our aid. Our military is well-equipped to use our nation's rough and mountainous terrain against the enemy - the engineer corps could cut off key land routes rather easily.

Also, our populace, particularly the rural folks, would certainly set up a guerilla resistance. This wouldn't be organized enough to defeat the enemy, but would distract them and reduce morale.

[Fatatatutti]

What would you do?

The obvious answer is that we would be prepared - i.e. we would not be caught unawares. Our first line of defense is on your doorstep. Our intelligence services know what you're going to do almost before you do - i.e. we know that your choices are before you pick one. So if you do plan to invade us, our Navy will be ready to harass you right from your own harbours.

So there's the Navy and if you get close enough, the Air Corps, and if you manage to land any troops on our shores, the Army.

In the unlikely event that we are overrun, we revert to guerrilla warfare. We have thousands of Army members trained in guerrilla warfare, ready to train millions of guerrillas. We have thousands of weapons stockpiled and millions of rounds of ammunition. We have the capacity to manufacture arms and ammunition underground. We have classes in guerrilla warfare for children, seniors, the disabled, etc. Every little old lady will be ready to stick a knitting needle in your eye. Every Cub Scout will be ready to set you on fire. We will never give in. We will eradicate you if it takes a thousand years.

[Tulais]

Tulais operates on a nuclear deterrence, or nuclear dissuasion policy whereas any attempts to attack and occupy our country would be met with a nuclear response - no country would reasonably be prepared to sacrifice countless cities and people for Tulais as a prize.

Barring that, in the event of a mass invasion of our borders and the inability of our initial homeguards to hold the defensive lines, we would send out a call for all forces to be recalled and/or mobilized to fight the threat as well as activating our defensive conscription laws; opening up our general stores of weaponry to our citizens and encouraging full-resistance.

If things look completely bleak, and depending on the foe we are facing, we may either surrender near the end or instead persist on and resist until unable.

[Holy Marsh]

There would have to be several modifications to this scenario. Being a state that was involved in a total war that lasted over two thousand years, the Theocracy does not have forces on 'leave'. Nor would it be caught wholly unawares- bordered on all sides by fellow members of the Romani-Mar'si Union, all of whom we dwarf or are heavily involved with, it would be neigh impossible for a 'huge force' to approach us without us seeing it. Marshite military adventurism, our Crusades, are never large enough to strategically imbalance a nation whose armed forces are well over a billion strong.

If some hyper-state were to invade us using magical means of avoiding detection, the first response would be from the Marshite Militia. These are not weekend warriors or a bunch of rogues grabbing AK-47s and riding around in technicals, mind you. They are armed, armored, trained for defensive conflict, and immensely reliable soldiers. The backbone of the national defense is the Militia, who through two thousand years of warfare have been the defensive juggernaut. Militia forces are the product of a religious fanatic warrior upbringing coupled with technology comparable to most second-rate NS powers- better equipped and trained for their role likely than their enemy.

They are trained to defend specific parts of the city, and activate in turn. They have not only a perfect understanding of their terrain, but a perfect understanding of how to use it. They are supported by vast tunnel networks and cities built as bunkers, with plentiful ambushes and close quarter fighting. More militia are activated over time. The enemy will have to pay an incredibly high cost in order to take territory in the cities. The Militia are allowed to make use of tactical nuclear warheads as well as chemical and biological weapons unique to the Marshite state. Such weapons can be used liberally- Marshites have rebuilt their cities hundreds of times in the past and see no reason they should be afraid to do so again.

If these charnel house cities are taken, the government will make use of strategic level nuclear strikes, chemical weapons, biological weapons, and bomber groups to reduce them to slag. Enemy forces that then push through this will deal with the standing Marshite army as well as the elite Holy Warrior divisions utilize thousands of surgical strikes to reduce and destroy enemy supply lines, command and control elements, communication forces, and even launch assassination missions against the enemy government and general staff. The Marshites benefit from internal supply lines and their fanatical devotion to Church and God just as the enemy supply lines and command are reduced to embers. Marshite strategic philosophy dictates that instead of one final battle, they will undertake tens of thousands of smaller tactical actions with a complex arrangement of feints, pushes, and reinforcements to reduce the enemy, break him, and then roll him up as whole divisions of his fracturing military believe things are going well. Superior training, technology, morale, and supplies will see the Marshites victorious. At which point we rebuild and determine just how many of our Allies we need to call on to return the favor to the aggressor.

Other benefits:
History. Marshites just ended a war that lasted nonstop for two thousand years, during which they were vastly outnumbered for the majority of time. They have been nuked, gassed, zombified, massacred, tortured, enslaved, eaten alive and dozens of other cruelties, and endured. They won't be broken or cowed or be brought to the negotiating table no matter the tactic.

[The Victory Corporation]

Some adjustments to the initial scenario: The Victory Corporation is not a particularly aggressive or imperialist nation, so while it is possible our troops may be on leave and caught unprepared, they do remain under strict instruction to remain in contact and be ready to mobilize in the case of an event such as this. Second, the Victory Corporation possesses an extremely low number of people in the military. Thus, for the purposes of this experiment, we will assume that the invading force possesses a more average amount of troops rather than a huge force.

First of all, the Victory Corporation prides itself on intelligence gathering. While our intelligence network may not be able to match a total investment as some nations have, getting eyes and ears in other nations is a regular task with long-term plans for playing intelligence-gathering agents as high up in as many nations as possible, while our own internal security is of top priority to deter our foe's own spies and saboteurs. While it is possible that we may still be caught off guard in the initial defense, we will at the very least be able to prepare ourselves for a counterattack.

Second, the invading army must decide whether to attempt to blitz through Victory Corporation territory or conduct a slower, more methodical attack. In a blitz scenario, the Victory Corporation will defer to guerrilla warfare, striking command, communication, and supply lines to methodically isolate enemy forces. Attempting to secure our cities will be a nightmare chore for this enemy, as the Victory Corporation's low number of soldiers comes into play with guerrilla warfare inside the dense urban centers, striking from all angles and leaving enemy guard troops confused and helpless to strike back without killing mass amounts of civilians. If this enemy does not care about civilian casualties, then the Victory Corporation will utilize chemical and biological warfare once other options are exhausted to turn anyone and anything into a potential hazard, and if possible infecting the enemy's own supplies with hazards to force them into the cities where they can be ambushed and methodically eliminated. Once the Victory Corporation's mechanical assets are mobilized, stubborn and isolated enemy forces can be engaged and eliminated with relative ease due to the Victory Corporation's investments in mechanized forces.

If this enemy prefers to conduct a slower, more methodical attack over a blitz, the scenario will be a bit different. Given that they likely spend days or weeks ensuring that their backs are secure and any cities they capture are free of Victory Corporation soldiers left behind to conduct guerrilla warfare in the manner previously discussed, such options will likely not be available without previously planted saboteurs or recruiting such saboteurs from the enemy's own army. However, taking this extra time will allow the Victory Corporation to mobilize armor and aircraft assets as well as stationary defenses. The Victory Corporation can then dig in and conduct airstrikes, leaving the enemy the option of charging into a high-casualty assault against established defenses or retreating before the constant airstrikes destroy their capability to fight.

Third, a counterattack. In this scenario, we assume that the enemy attacked without prior warning or any formal declaration of war, perhaps attempting to quickly take the Victory Corporation's territory for itself and suppress any information of what exactly went on, declaring a "peaceful annexation". The Victory Corporation can spread information of the unprovoked attack to gain sympathy and possible advantages from nearby nations. If nuclear, biological, or chemical weapons were used in any way, the Victory Corporation can spread information that the attacking nation used it, whether such information is true or false, gaining further sympathy and possibly triggering declarations of war from other nations to the hypothetical attacker. A direct counterattack would likely start with assets within the hostile nation being activated and instructed to, if possible, assassinate political and military leaders as well as incite any dissident groups to openly take up arms and rebel, creating chaos and forcing the enemy to turn its attention inward rather than prepare for the main strike.

In this scenario, the hostile nation's losses from the failed invasion, combined with the Victory Corporation's counterattack and possibly attacks from other nations, would likely lead to the quick downfall of the aggressor and a stronger Victory Corporation.

[Prosorusiya]

It'd be in deep trouble, certainly. My most probable opponent is Russia, against whom we'd definitely lose. What we'd try to do is contain any border intrusion, after being tipped off by the Border Guard as to the whereabouts of the invaders. The next thing we'd do is scramble our Air Force, to regain Air Superiority, and carry out air attacks. We'd then begin to maneuver our Armys Regiments into a position to form a new defensive line, and probably bring in some heavy artillery. Following that, we'd probably try and break out with the help of paratroopers and heliborne troops, and regain the original borders. That said, what would more probably happen is that we would have to concentrate around Grozny because the Russians would have broken through our lines. Fortunately, our best units are in Grozny and would give them a heck of a whopping before we'd be forced to surrender.

[Cou Sasio Forte]

Most of our citizens are armed. Though they're not organized enough to defeat a professional army, they'd put up a tough fight, and most aggressors would decide we were more trouble than we're worth.

[Dread Catsylvania]

Same thing as what worked historically - withdraw to our fortified positions, and let the undead and demons that live in our forests and mountains weaken their forces while they attempt a siege.

[Vault 93]

Close the Vault door until they give up and leave

[-the CHINESE nation-]

Shift the heptapeiron we're in. Works every time.

[United Territories and States]

Assemble all troops with Power Armor and see how it goes.

[Troperia]

Just ask Skyhooked and Vulkata II to help.

[The Gamindustrian Union]

Rally all active forces.
Mobilize all conscripts.
Transform into HDD and decimate their ranks.
Ask the UN for nukes. If given the green light, nuke them.

[The Grand World Order]

First and foremost, the GWO puts a major emphasis on intelligence capabilities to prevent precisely this situation.

Given the very disadvantageous characteristics of the GWO's geography (we're scattered across eight continents), most of the GWO is in a "hold out as long as possible" doctrine that relies on waiting for reinforcements from the rest of the country to surround the invading force. If Magna Polis itself is under attack, and the Capital Defense Zone is unable to stop the invaders, it will have weakened them enough for the Federal Navy to easily mop them up. Only one enemy force has ever made it onto GWO soil, and that was largely in part because they shared a land border with us.

There also exists a 2.5 billion-strong militia in the GWO, which would support Federal operations and fill in gaps wherever they occur.

In addition, the GWO will begin mass submarine-launched cruise missile strikes against the offending country's homeland, primarily targeting centers of government and military command, economic landmarks such as stock exchanges, and shipyards capable of servicing naval vessels.

[Eahland]

Imagine this:
Caught unawares, your country has been invaded by an army bigger in huge size compared to you and that you do not have much time to prepare defenses or much of a counterattack. Parts of your armed forces are on leave and that some are also away in other countries. What would you do? Simply, send nuclear strikes to them? Demand that all civilians fight for your country? Rally all available armed forces and try to fight back? Or would you just surrender. What would you do?

This is really not a thing that could happen. An army large enough to be a plausible threat to even the Cynehere alone, say nothing about active fyrd, on the field of battle is not something that could be moved unnoticed. It would require huge convoys of transport ships or trucks or trains, vast quantities of fighting-men, huge flocks of aircraft and multiple carriers and their consorts or control of ground bases in the region, and it would have to be moved through hundreds of miles of allied ground or thousands of miles of sea patrolled by the Cyneflothere and seeded with chains of undersea listening posts, all under the watchful eye of Cynelyfthere satellites. Even in the worst case scenario, we would have at least days to prepare, and more likely we would notice any likely enemy making preparations months in advance and have that time to make our own preparations.

(Actually, the worst case is nuclear SLBMs launched from somewhere off Codnæsse - Cyningham is not coastal, but still close enough to the sea that we wouldn't have enough response time to do much more than get critical figures into the deep shelters - but that's a completely different scenario, and probably ends with most of the world being rendered uninhabitable by the resulting nuclear exchange.)

[Smara]

Small armies, Smara could handle well, as it is doing now in the miner invasion who looks to destroy Smara for iron, coal, and gold. When the army is large, why would they even want Smara? The people have fled to Smara, the island, from the mainland who fights wars too much. Is there anywhere to escape after this? Seeing that Smaran weapons are defenseless against the killing machines of the mainland, Smarans must turn to words, which may not achieve their desired purpose. They let the army overrun the land, but the people have disappeared already. No people to conquer. Soon, the land, bomb pocked and in polluted ruins, shows the invaders their good work in search of a "promised land" which they already had but made it in their horrible image.