I think that using the Mass Levy precludes the use of City Levies. The Mass Levy is essentially using all the City Levies at once and unleashing them on a single target. They use the same fundamental manpower pool so we can't exactly use it twice. We could split the Mass Levy, but that would weaken it significantly. That may then mean we fail to take Thunder Plateau or hold back WW/Stymyr. We may not be able to afford the Mass Levy long enough to fight off all three of them. It's millions of men, but split across 3 fronts that becomes a lot less impressive. We can fight on those fronts, but I'm not sure it's enough to win.
This, at least, can be resolved.
@Aranfan: comments on the above?
If this universe means that dealing with minority groups within your country is impossible then we may as well start polishing our jackboots. We're multicultural now, but that's a problem that can be fixed. I don't like this line of reasoning because of where it goes.
Stymyr and the Tin Tribes are also not comparable. The Tin Tribes have control over a strategically valuable resource (tin) that's necessary to our economy and military. All they have to do to disrupt the Ymaryn as a whole is nothing and they have an extremely defensible position with which to wage warfare from. The Danube river basin area of Stymyr has nothing like that. It's a nice agricultural area, but we have tons of those. It also lacks the defensive terrain that would make the Tin Tribes so difficult to deal with. Despite being larger, Stymyr is much less important and much easier to digest. They'd have to somehow go to war with the entire empire to be nearly as disruptive.
Our internal cultures already see themselves as Ymaryn; nothing to worry about there. It's the process of digesting conquered cultures that is problematic.
Stymyr may well be more comparable to the now-conquered not!Slavs in Western Wall, who would have "screwed us over" through "ill-timed rebellions". While we're getting into two wars seems like ill/perfect timing for such a rebellion.
You seem to be focused more on possibility and ignoring the cost. We could digest Stymyr, in the absence of distraction. What we cannot do is tank the cost when we're heading into two wars.
Tinvalley is a... valley on our end, not defensive terrain? If anything, getting troops to Greenshore and Stymyr would be even harder, since we don't share a land border
When we overhaul Stymyr's bureaucracy that's going to make their nobles mad, but the general populace? They'll probably enjoy a fairer bureaucracy with a higher standard of living. A bureaucratic state is likely much less arbitrary and abusive than a feudal one. The general populace is where military power resides in Stymyr, especially since they can occasionally manage a City Levy. Keeping them onside is important and we know from our experience with Tinshore that the common folk love it when the nobles are humbled. It's in the interest and desire of the common people to be accommodating to us. The masses are what's important to win Stymyr, not the nobility.
I might ordinarily accept that good treatment of the masses is enough, but the Tin Tribes vote shows otherwise: if we don't reestablish their political structures (i.e. give Stymyr semi-autonomy to continue doing what they were doing), it's a "trap option" and will eventually screw us over in a way analogous to how the rebelling not!Slavic tribes would have. (Only far worse, since Stymyr is a fully developed state with furthered proto-nationalism.) Even the option to integrate them as full Ymaryn citizens, but not to preserve their power structures, was a "trap option".
I don't like it, but that's the way it is.
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Stymyr is allowed to have Revanchists too and that's much more likely than the Ymaryn.
No, as Stymyr's Personal Stewards of Nature is degraded. We also know they accepted a peace treaty with a territorial loss to Tarta, something we're unlikely to do.
If we go for a minimal peace, it confirms history. The Ymaryn have spent thousands of years White Peace-ing everyone around them. They have no reason to suspect that to change.
I don't think anyone actually knows history that well. When we White Peaced Hellas, everyone was like "wtf".
The Ymaryn have spent a thousand years being this mysterious shut-in (which is a long time to try to remember anything), and no one really knows what to expect. Counting on milennium-old history to predict behavior is kind of an iffy prospect, anyhow.
"We gave you a chance" is a reasonable strategy of escalation. For all the Stymyr know, we won't give them a second.
Moreover,
we ourselves don't know that the next time we won't conquer Stymyr, so it's impossible that the Stymyr would have any true insight as to that. The vote was fairly close even this first time; if the Stymyr do receive any rumors, that will be the message.
Why are you dissing Western Wall? They're absolutely powerful, perhaps contesting Black Sheep (though without the benefit of defensive terrain) for most powerful splinter of the Ymaryn Empire. If I was placing bets at the start of the quest, I would've bet on them being the winner of the Ymaryn free-for-all. They have a navy. Everything we did against Greenshore and Tinshore, they'll do against the Core. It's foolish to assume they're not a threat. I think you're direly underestimating them, especially if they've bulked up a lot on conquest or with friends in Stymyr. A WW-Stymyr alliance is an existential threat, especially if they attack us while we're at war with Black Sheep.
Western Wall is feudalizing (so we can expect reduced administrative efficiency) and busy consolidating their northward conquests. I question their ability to do so
at the same time as traveling five-hundred miles in the opposite direction to attack into our mountainous center of power, with our minimal supply lines and however-many millions of defenders right there. It's kind of a nonsensical operation.
On the off-chance, our new nomad friends would, hopefully, give us plenty of forewarning.
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The Revanchists wants are very simple: our land back and our Prestige. If we lose land, that's worse than gaining it. Their entire faction was spawned by losing most of the Ymaryn Empire. How do you think the average person will react if they hear we lost land? They'll go the Revanchists were right. We should've gone for a hard border.
As we've established, the Revaunchists aren't sophisticated enough to argue for a hard border. No vindication; only the same complaints. At most, they might get angrier and throw more fits; but that is different from being strengthened.
We are absolutely obligated to fight both.
]If we lose land, we immediately start to Death Spiral. That's not an option. We can't afford to take the risk that we lose it. The Ymaryn aren't permitted to just walk away from the land they own. Our Value mean we must protect our land. We have no other choice.
In case you haven't noticed, we
have lost land: Revaunchism is the result. There's no additional force that will make more land loss death spiral worse than before, or force us into two eternal wars at once.
If we aren't now forced to fight Stymyr and Black Sheep simultaneously, then we won't be after we weaken the revaunchists even further.