I feel that Rome during the 2nd punic war was extremely lucky since Hannibal didnt have enough troops to mount a successful siege against Rome itself, especially since Hannibal was absolutely dominating his opponents.

Im surprised that Carthage went down so easily, they were the trading power of the west at that time, they had a fair navy and large territory.

When I first looked at the title I thought you talking about the Pubic wars, shame really