I was looking at the 'provinces' map in the ed5 army book, and Middenland's involvement is beset by geographical difficulties.
Either they will have to invade Talabecland, travel by cruise liner up the Talabec river or the Reik and then the Stir, or have some sort of movement alliance with Hochland and maybe Ostland.
Bearing in mind the 'movement of troops' credibility of Karl Franz's and Valten's armies in the SoC, this is an aspect of the campaign that probably needs some early thought.
Obviously many of us are 'planning' our involvement and which side of the triangle we want to be, and those of us with 'northern' allegiances have to get together to move our troops early.
Maybe the forces of Middenheim/land should be the initial aggressor, having secretly moved their Ulrican 'mercy missionaries' into position.
This would be perfectly logical as culturally and intellectually more advanced than the plebs of Talabecland and Stirland, they would naturally be more "pro-active".
Of course the Tsarina, with the mutual respect of fellow powerful animal
lovers (Bear and Wolf), has also negotiated a deal for one or two trading rights, and other benefits for her aid.
(First shots across the bow)