One of the few pieces of canon lore we have on the Shadowgor Warherd claims that they specifically hunt down Bretonnian knights because they like to use the helmets as war trophies.
I think the hard part of getting Bretonnian help is figuring out how to fit so many Knights Errant into the beastpaths.
I didn't know that, you make a very good point.
If we manage to have Bretonnia declare an Errantry War for the Forest of Gloom, have some support from the Empire and the Southern Realms (wich likely would be very happy to see the Forest of Gloom stop spitting out Waaghs and Waherds against them) and the full might of the Karaz Ankor behind us.
Then the campaign becomes a lot less "insane Hell War" and more "hard fought invasion of hostile territory".
Unless we are very unlucky and the Goblins/Beastmen have some very skilled commanders that decide to turn the Forest of Gloom into Fantasy Vietnam.
Having our forces slowly bleed out after an incredibly long guerrilla campaign.
I think only closer Hellwar is Skavenblight and calling them to it is ...eouch. That is a war that I am not interested in having at all. Not without some really good advantage anyhow.
To take Skavenblight, we would need the combined might of the Empire, Ulthuan, Karaz Ankor, Bretonnia, Kislev and probably several of the Southern Realms.
And that is the best case scenario, in wich other enemies don't take advantage of the Forces of Order begin distracted waging an Hell War against the Skaven to invade.
We could find a big enough Waagh to manipulate into attacking Skavenblight to weaken it.....
Any idea were good old Grimgor Ironhide is currently? We have a job for him!
I feel like readers are glossing over how terrifying the fact that Mathilde can just casually whipping up and then directing a minor Waaagh!is to most of people in setting.
Imagine if she actualy put some effort into it.
Rallying a giant Waaagh! Just to use it as a deniable asset.