The IC reason for the war was food sales to the enemy
Like I said, not only did she dismiss that, nobody bought it anyway. It was flimsy then and even moreso after the fact, particularly given Sorraine's goal of eliminating Ohnar entirely. Galiard never would've gone for destroying Kindara or Zonasa even if he'd been able to and murdering a foreign King is a bit worse on the scale of Bad Things to Do than selling some food.
Sorraine thought they could get away with it. It was evident from the beginning. They were probably right. I don't think anyone would've sent armies to help Ohnar had they been down to one region.
