[Endoperez]

I seem to recall a similar post a long time ago. If it is the same case, one of the units in a battle is dead but hasn't been removed. I think that he was places inside castle walls then, and the 50-turn rule routed the attackers.

And if you hadn't heard it before, Något gick fel is Swedish (mother's toung for the Illwinter) and means "Something went wrong".