Unioners will have a pretty pivotal role in this whole affair, being where they are. They'll also come under extremely heavy fire.
Junkers would have a field day with this war, tilling the battlefields full of wreckage and selling information to both sides. I could see this being a very touchy matter with Gallia entering the picture, though. It'd also be dependent on how public the Junkers' assistance of Gallia will be.