I lost?

[Iron Duke]

Ehm, sorry for bringing this up, but there's something seriously out of track here, because after the interesting demise of my army I renewed the assault on the same province two turns later, again their army is routed, battlefield only belongs to me, yet my attack seems to have failed. My alive troops somehow count as dead, and I see ulm boars in the province that defeated my attack, but there weren't any in the combat. Either I'm doing something terribly wrong, or something's amiss in the game. There's a single battle report on that province, not another. I've watched the battle 3 times(again) every one of them is the same, me defeating ulm(yet again) but the province somehow doesn't want my rulership.

I'd appreciate any help, because it's getting so frustrating for me.