I had the same problem with the game crashing when the end turn button was clicked.

It happened to me about three times, in a row at the same point. The game was creating the 'Autosave' and I ws reloading that. It contunued to happen so I did a quick save and it worked fine and I have had no other problems. I have heard that the quicksave doesn't work correctly but its the only thing I did differently which made the game work, So I don't know

In my game i'm playing as the Julli, Bruti and Senate are dead Also I do not have any unmanned forts. J

Just thought i'd put my 2p's worth in