After two missions I get the message to end the turn, which I do. After that a window pops up inthe bottom left corner of the screen telling me to "march against the rebel lord and finish his reign". Plus in the middle of the screen it says "Attack the rebels!". The thing is I don't know how. I don't see any rebels and I'm kinda stuck in my territory in the south west. Is this a bug or am I just missing something here?