Looking at the maps for Gerogia, there is a major chokepoint outside of Tbilisi where rivers and two mountain ranges come together and the road network threads through. There are also several key bridges and overpasses. That is where the battle for Tbilisi would be. Pretty interesting.

Follow the roads out of Tbilisi West and you will see that it narrows to a gorge with a RR on the S and a road on the N.

http://www.maplandia.com/georgia/geo…ories/tbilisi/