this is one of my series of high population career cities. It was done on hard difficulty with just a single barracks, therefore all towers are connected by road to the barracks. The hardest part was keeping the Grand Insulae block stable prior to the increase in the amount of oil that could be imported. The blessings of Ceres were used to bloster farm production. I was able to increase population with large tents due to the modest prosperity requirement in this assignment. Hannibal and his elephants weren't much of a problem, although one invasion from the Nth East did decimate my legions rather badly, and they took a while to replace.