We had a few great comments on the previous post. After I posted that, I spent the majority of the next two days in an interminable, useless exercise that was euphemistically referred to as "training." So I had lots of time to think, and one of the things I was thinking about was a goblin invasion of the United States.
Nadporučík Lukáš actually hit the first thing that occurred to me. Fuel Air Explosives are the next best thing to a pony nuke, and can be delivered from well outside of bowshot. To say the least. Air power and artillery are going to be the biggest tools in our pocket. Isegoria chipped in with some insightful analysis - especially the point about mechanized infantry. Goblin swords are not going to cut open Abrams tanks (or at least, not fast enough) to do the trick, and meanwhile the heavier weapons mounted on Bradleys, Strykers, even Humvees are powerful enough to kill Goblins as I described them. And mechanized infantry and armor units are going to be significantly more mobile - both in the field, and on the roads and rails.
Now, even with the advantages pointed out, the goblin armies are going to be like Japan in the first part of WWII. They're going to run wild because I doubt even the most paranoid members of the Pentagon's planning apparat have seriously laid in plans for a goblin invasion straight into the middle of the country. When I was first imagining this, I was picturing the gate as a kind of shimmering aurora that ran east west from roughly Oregon through the midwest, up through Ohio across Pennsylvania and out into the Atlantic somewhere south of NYC. And the Goblins pour out of this in uncounted hordes - because that's what goblins do.
A huge fraction of our ground forces are deployed overseas, and useless in the near term. Most of our military bases are not located close to the veil - they're in the south or southwest. The Air Force could deploy in strength immediately, and Naval and Marine Aviation could chip in as well. But there's nothing but lightly armed civilians through most of that area, and in the east, mostly unarmed civilians. How long before guard units are called up, divisions moved by rail and road up from the south? It'd be a while - and even longer before we could get anything back from overseas. And really, this would probably be a global phenomenon - will all the forces be able to disengage immediately?
I think they could conquer a large amount of territory before we could launch an effective response. There'd be millions of refugees fleeing south on all the major roads, and north into Canada. Millions more Americans wouldn't be fast enough, and would probably be killed, raped, and then eaten.
Once we get moving, the advantages Isegoria pointed out would come into play. But a lot of the fighting would not be in open terrain - forests, woods, urban terrain do not generally allow 500 meters for restful plinking. It's door to door, and dense undergrowth. This will limit, to a degree, the advantages of infantry firepower. In house to house combat, I think a full suit of bullet proof armor, a magically sharp sword and a determined attitude will count for a lot.
Still, I think that Isegoria is right. Modern American technology is going to win the day in that scenario. Our logistics - rail and roads - will allow us to move forces outside the immediate combat zone far faster than they could imagine. Paratroopers, vertical envelopment. Tanks and IFVs. Artillery, MLRS, down to mortars. GPS guided bombs, FAE, napalm, daisy cutters, and when all else fails, strafing runs from A10s and their very, very large gun. Spectre gunships, fer chrissakes. Air superiority and artillery, logistics and mobility would all trump a moderate immunity to bullets.
So, what would the goblins need to even the odds a bit? If we were writing a story, we wouldn't want the US Army to stomp right back to the veil in a week, and then go straight off and free magical worlds for democracy. That's a horror story, not an adventure.
My first thought was the other standby of fantasy, the dragon. If the goblins can have bulletproof magic armor, then I think that we can reasonably presume that a dragon is going to be at least as formidable as an Abrams tank. With monomolecular claws, airmobility, and plasma bolt breath. Now, the dragon probably wouldn't be as fast as a helicopter, but it would be much harder to kill. If it's plasma breath can cook a tank, then the goblins have a force multiplier. Would this even the odds? Not by itself, unless there are a fuckload of dragons. So let's assume that each regiment of goblins has a dragon. The dragon can offer:
- CAS - its plasma cannon mouth will cook unprotected infantry easily, and a well-aimed shot will light up a tank - especially from above. While there aren't as many dragons as tanks, the dragons will be harder to kill.
- Limited air superiority - the dragon might not be as fast as human aircraft, but it is maneuverable and very heavily armed. It could knock helicopters down with its claws, and planes with a dose of plasma. This would pretty much remove the spectre gunship and apache threat, and pose serious harm to anything flying relatively low. It would not help against stand-off weapons and bombardment from altitude.
- Tactical mobility - it could carry thirty or forty goblins at a time - dragonborne troops.
Look at this as if you were a cthulhoid malevolent intelligence planning the invasion of Earth - what creatures of legend, or what types of magic, would be required to even the odds?