I'm new to CIV 4 so as I play I need to figure things out. In one game I am playing I am the Romans and I have the Germans to the north of me. Their culture is encrouching on mine to the point where I am losing too much territory. Since I can't "out culture" them I decided to go to war with them. I took over one city and destoyed another, but my culture border barely moved (if at all). With the city I have taken over, how soon will it be before the German culture subsides and the new Roman culture begins to take over? Over time, will the number of Germans in the city go down and the Roman population rise?