The city of Tarl is under seige, though that's likely to change by the end of the night, one way or another. A flight of bombers scream past the already-smoldering skyscrapers, new fires blossoming in their wake. Flak ineffectually lights up the night in their wake. Below, in the cratered remnants of the minefield separating the city limits from the enemy's line, armored troop carriers and tanks start their advance, crawling slowly across under covering fire from shielded batteries that stifles any sally the defenders might attempt in response.
She's fighting a supervillain - she hates that supervillain is even a category, but that's what she's doing - when the guy fires off some kind of portal gun, and then she's dealing with more than just the one guy.
She scans the sky for portals back. She takes in the fires, then the attack in general.
Her first impulse is to defend the city. This is a bad impulse to run off with without checking in on things - she doesn't know what the political or military situation is, and attackers aren't always the bad guys. If the Allies are trying to retake Paris, you...?
Well, you put out the fires, anyway.
She puts her standard bubble-construct up for armor and flies up to the nearest skyscraper to check whether it in fact has anyone inside.
There are a lot of armed and uniformed men and women inside! Many of them are now pointing said weapons at her. One in the back seems to be whispering a description of her into a communications device.
"Identity yourself," demands someone who may be an officer, judging from the insignia on the shoulder.
"Literally no one, I got shot through a portal about three minutes ago and this is where I got spit out? I did notice the warzone thing, I understand that this is a really bad time for you. If it would be better for me to leave then I can do that, you just looked like you might plausibly need some help on the not all dying front? I am a fan of people not dying."
"I got shot through a portal!" she says, helpfully. "I'm wondering if there's anything I can do to help, but your people are understandably very concerned about the sudden unexplained interloper. That's about it on this end, I'm pretty lost. Sorry for diverting resources from the primary matter at hand, wasn't intentional."
Hmmm. Assuming that supers are as thick on the ground here as they are at home, and assuming that they're as varied as they are at home, sometimes with access to honest-to-goodness magic, and carefully not making any assumptions about whether the person she's talking to is generally on the up and up, and knowing that a bunch of people are going to die if they somehow get to Earth and invade, even given the Justice League's obvious ability to oppose them -
Oa can handle itself, surely.
"The Green Lanterns are based on a planet called Oa. We're a peacekeeping force that spans the galaxy, so we get called in to deal with anyone similarly powerful who wants to make trouble. Unfortunately, the troublemaker of the day has a portal gun, and apparently he can send people pretty far away from where he is. I'm gonna try to get home after this, obviously, but I'm not in such a rush that I can't stop for anything."
"I mean, unless half the galaxy is 'far outside Oan territory' I think you might be from another dimension or something." Or just actually insane but that wouldn't be productive to say. And there's the weird mask and the weird costume and the weird green glow and all that together adds up to a whole lot of weird.
"That's possible. Might honestly have been easier than transporting me a couple galaxies over, though I've heard of both things happening. Ohh, I know," she says, and gives a mental command to her ring. "This is - yep, nope, comms are dead. Different dimension or profound interference it is."
"Fairly negligible. If I wanted to turn the tide of this battle by myself I would have to run some serious calculations, but I'm pretty sure that trying to win a war that you know literally nothing about is against one of the cardinal rules of diplomacy anyway."
It would be worth thinking about if she didn't have her backpack on her and her lantern in the pack, but luckily her past self has done her a solid here.
"Huh." Okay, yep, running on different rules. "Well, it's not like you could actually win the war from here. It's just one planet. And the Compact doesn't care much about it or the assault would have more magical support than that girl down south. Of course, the Domain doesn't much care either or it'd be more than me and Cia."
"Cool, cool." So a pair of intentional evil matriarchies, insofar as anyone involved is an evil matriarchy. Unless there's some reason the magic only ever works for girls. Diligently not making assumptions, here. "Lemme know if the questions get annoying, I know you have a lot on your mind right now."
She lands a reasonable distance away from her guide, close enough to continue the conversation and far enough not to crowd her too much if she has to move around. "So. You're Domain and they're Compact." Can't exactly ask who the Axis powers are, can she. "Does the war between you have, like, a specific goal, or is the Compact just evil braineating aliens who bodysnatch your friends, or - International Relations 101 would be good right now."
" - ah," she says, looking up at the buildings. "Cool, thanks."
She's thinking less Axis and Allies and more Carthage and Rome, maybe, at this point. Modern Carthage and Rome would be something. She's not actually sure how you stop Carthage and Rome from being at each other's throats. Good thing this is probably an academic question for her, because surely someone will reverse the portals at some point and then she'll be able to tell Oa about this and they can decide what, if anything, to do about this massive galaxy-spanning war in another dimension.
Unless they don't.
She floats up a hundred feet again, figuring this is a vantage point that gives her a better view of whatever's about to happen, and waits for the tanks to show up.
Which they do in short order. Lines of bright sparks race up the sides of the buildings and they crash into the ground, creating a wall with one gap where she stands at the intersection. The tanks pause, and then begin funneling towards the hole. She waits until the first one is almost on top of her before pulling an enormous warhammer out of nowhere and taking an underhanded swing at the front of the tank and sending it flying end over end through the air as if it were made of paper.
An explosive shell screams down and detonates directly on top of her. When the blast clears, she's standing in exactly the same spot, apparently entirely unaffected. She tosses the warhammer aside, and it vanishes as she rushes forward to punch a tank literally in half. She then jumps up and smacks the ground upon landing, creating a shockwave that bounces the two pieces into the air. A beam of light shoots out from each of her now upraised hands, clipping the floating scrap and sending them crashing down to explode.
She continues destroying tanks and essentially ignoring incoming fire. Occasionally a particularly heavy concentration will make her pause for a moment, but she's always right back into it afterward. In a little less than ten minutes, there are no more intact vehicles in the immediate area and the buildings have been ground into even finer rubble.
She takes one last look around, dusts her hands off, and trots back over to where the green girl is waiting.
"Just a bit! But I daresay I'm not having the worst day out of everyone in a one-mile radius right now. D'you mind me asking - if the Compact doesn't care about this place, and you guys don't care about this place, and it's not really strategically relevant in any way, is there, like, a reason to be fighting over it? Surely you could find less lethal ways of practicing."