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64

Modern defense using Western (NATO) weapons: Bad news for the troll-warriors and their slaves: We've practiced defensive warfare for centuries, and it's brutal. At 3000m, a rain of 60mm mortars devastate their formation, spotted by hidden observers and directed by radio or field telephone. No large formations of conscripts after that - the smart ones just ...


41

It wouldn't be an 'all at once' kind of scenario. It would probably go down something like this: 0-1 hours: Initial invasion. Massive wave of 911 calls results in large scale but uncoordinated response by local police. 1-2 hours: Scale of event begins to become apparent. SWAT teams are deployed, but not in a very coordinated way. State Governor calls up ...


24

The system under the Constitution in the USA makes that kind of fracturing pretty hard. What makes it harder now is that a steady increase in power of the federal government has reduced the amount of power that each state has. If you look at the Civil War in the 1860's, the wedge issue was slavery. The precipitation events, though, wasn't slavery itself, ...


24

Lots of people think we're currently on the verge of Civil War 2.0 Or that we're already in a "cold civil war". Haven't you heard the Claire Wolfe quote? “America is at that awkward stage; it's too late to work within the system, but too early to shoot the bastards.” Civil War 2.0 already has a nickname: the "boogaloo". No few observers expected it to ...


20

The answers discussing USA response are very good (time to get armor from Hood, etc.) But I would add that air attack would be very effective (big bombs blow rocky golems apart, heavier canons for golem breaking) and unopposed (lack of golem ranging weapons). Within the day many, many Naval and Air Force aircraft in the Western US and offshore could ...


18

Lightly-armed troops would arrive in a few hours. Useful amounts of heavy armor and weaponry would take days. This answer ignores USAF and USMC fighting response, since the OP asked specifically for Army. (looks like an edit changed that) Getting troops there isn't the problem. The nearest National Guard brigade is at San Diego, with subordinate ...


17

Look at this The Telegraph article and scroll down to the Falklands entry. Dump the NBC gear and carry more food, ammo, and electronics plus batteries instead. Modern radios, night vision gear, light drones, and similar gear. They will make quite a difference. A modern military would find it difficult or impossible not to bring rifles. That's what they're ...


16

To steal from the book Unwind-- abortion is a big one. One side believes that the other is literally murdering babies, so they're primed to fight. The other see sit as a form of slavery for women due to the choices of others, so they're also primed to fight. Boom-- civil war. I think that income inequality might finally boil over into a civil war at some ...


16

Shock and awe. The idea here would be shock and awe - convince your enemy that they are faced with an incomprehensibly more powerful opponent, so that they surrender and agree to terms. Your enemy is not going to understand what sort of abilities the moderns have. Keep it that way. Your moderns are not going to be swapping fire with enemies. They are ...


15

Depending on what the threats are the numbers will change so try updating your question with some more information about it. But to give a bit of a ball park that would be realistic if you ask me. No real threats, just a police force ~1% Some military for exploration in possible hostile territory 1.5% Confirmed hostiles in the area but no real war 2.5% ...


15

These days all Western countries are alert to the danger of a Mumbai-style terrorist attack, involving a significant number of gunmen with automatic weapons attacking a crowded city location. It is reasonable to assume that LA is well-organised and briefed do deal with this. (In the UK, an SAS unit helicoptered in within minutes of a terrorist attack in ...


13

Food. Animals that big need a lot of calories. Maybe giants eat huge quantities of plant material like elephants. Even elephants prefer crop plants like corn and melons over grass and bark. A giant can do more work than a team of horses. Employ them to do agriculture. Pay them with funds they can use to buy the huge quantities of food and beer they ...


11

You can see fires from space, but even really, really big fires are usually kinda small by the standards of a planet. Moreover, blobs of fire like that won't last very long because the fuel in them will be exausted and what you'll get instead is a wall or front of fire that is blown downwind until it reaches somewhere that's too damp (like the sea) or has ...


10

This happened quite frequently in the past, and has indeed quite some advantages. As you state, they are often professional. Their loyalty is with the money, and they will follow whomever pays (the most), or whomever they have a contract with. You need to consider that a hired solder has nothing but their integrity. If a solder is known to back stab and ...


9

A lot can happen in twenty to fifty years. Let us say that we finally figure out AI. We can build robots that can actually follow orders and be smart about it. Neat! Except... these robots put a lot of people out of work. So, on one side we have a large mob of unemployed angry people. On the other side are the industry owners. Fewer, but better ...


9

Energy All conflict boils down to who can concentrate lethal energy onto their enemy the fastest. Modern militaries are powerful mainly due to the amount of energy they can bring to the battlefield. An M1A2 Abrams carries 500 gallons of fuel to push 70 tons of metal around the battlefield over 40 mph. It's turbine engine can generate 1500 HP. So one ...


8

On which parts of a ship could this magic be used? The hull: Ships during the Age of Sail had always the problem with water coming in through small gaps in the woodwork of the hull. A fused wooden hull would be (nearly) completely waterproof, and as such reduce the need for bilge pumps. You won't remove them completely, because you need them in case of hull ...


8

Not really, no. Just put steps to the sides of the pole and you'll have a nice quick ladder. You might even design some endcaps for them to be stackable. To expand on this: further advantage of these ladders is that you can more easily carry more and more encumbering equipment needed for this mission: huge hammers for demolishing mechanisms, burning ...


7

Neither Heaven or Hell can be Conquered Any story with humans physically killing angels or demons, isn't following canonical Christian theology. Generally, they force God, demons, and angels into following the rules of this universe - giving them qualities such as mortality. To put it simply, if human weapons worked on demons, Christians would go ...


6

I want there to be a civil war occurring in the United States I don't, but I understand this is an hypothetical and academic view of the subject :) even when partisan tensions have been high in the US in the last 150 years, it continually does not result in literal civil war. (Emphasis added): Good observation. The reasons and value backdrop for this ...


6

An election season in which the left leaning Democratic party took control of both sections of congress AND the Presidency could lead to a civil war. I will try to keep this as neutral as I can because I personally hate the party system and think it causes basically every heavily polarized political argument in our country. As the United states has a long ...


5

I have a few things to note that have not yet been covered in other answers. Flexibility: traditionally, wooden shipbuilding used a time-consuming process called Steam Bending to temporarily soften pieces of wood in order to plastically deform them into the necessary curved shapes. If a mage can do that faster with magic, construction could go substantially ...


5

As is so often the case, you should ask yourself what problem you want to solve. Having an army is an expensive and also a dangerous hobby. It means having a large group of well-educated and armed people, that sit around doing nothing while still needing to be fed, clothed and equipped. You have a post-apocalyptic setup, and all of the population of a medium-...


5

Have you seen the anime Gate: Thus the JSDF fought? It follows the premise you're suggesting (world rediscovers magical portal, modern military is sent in to deal with the situation), and offers some great thoughts on the viability of certain strategies and weapons. Specifically, the armor imperial soldiers from the magic world have is no match for standard ...


5

The light traveler approach Some of the other answers here have already explained what you can do with a full range of modern infantry equipment, so I'll take a different approach and explore the most economical route. Naturally, the most efficient method is to use your allies effectively. You want to link up with them as soon as possible. This way, they ...


5

For quick response, armed attack helicopters and / or jets. There are three weapons that armed attack helicopters provide for use against golems; some of the comments up stream imply that small arms may or may not be effective. (This answer, mildly informed by some QRF operations I was involved with IRL, is aimed at helping you tell your story) Hellfire ...


5

Personally i think you got the wrong idea about the effectiveness of Air and naval warfare. Most of the war between Germany and Britain during world war 2 was fought in the skies. The effectiveness of destroying the opposing sides means of production, and strat bombing to reduce their morale is highly valuable under any military circumstances. ...


5

TLDR; navy and air force are often the deciding factors, and ground forces are only sent in to "mop up" after. I think you don't have the right idea about the effectiveness of navy and air force. True, having solely navy or air force available for an invasion would not be very effective, and wars have not historically been won by bombing alone. But I would ...


5

Ancient armies were not stupid. Their tactics balance their goals, their constraints, their information available, and their resources available...just like ours do today. Medieval tactics were generally built around horses as the kings of the battlefield. Infantry formations were designed to protect from fast-moving cavalry attacks (pikemen, for example). ...


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