I happened to glance at the area around Berlin and it raised a few questions, probably because I am not as familiar with this period as I should be.
I was under the impression that the fortress near Berlin was at Spandau (a brick citadel), which, although it exists, doesn't seem to be particularly fortified.
I was also under the impression that Brandenburg was more of a territory than a town, and that it's 'capital' was Potsdam.
Which leaves me scratching my head over the fortress of Brandenburg. Was that a town, and should it really be fortified?
I would love it if someone who was involved in sorting out the geography for the game would come along and set me straight on this.
(And I still think that the western side of Leipzig should be backed up against some kind of river to represent the marshy confluence of the Pleisse and the Elster).