Okay, this is bugging me. I am in an alliance with the Drengin (I have no idea how I ended up in this alliance, I never proposed or accepted it, but that's another issue). They are about to win by an ascension victory, so I need to attack them, but it won't let me it says I have to break the alliance first. But I can't work out how to do this. I can't see an option in the diplomacy screen or the treaty screen 