If you are a Historical man..

If I was Hannibal, I would have attacked Marcellus's army sooner and stopped him starve my men out in the first place. Moreover, instead of simply ignoring other Roman cities and not placing garrisons in them (Hannibal just wanted to get to Rome as quick as he could, and so didn't bother with placing garrisons in, which were time consuming and complicated), I would decimate them, which, in the long run, would mean a longer war, but it would mean that Marcellus would also starve and I would be assured that Roman economic paralysis would do weaken Rome itself for the final assault. Supplies just kept coming in for Rome and the other Latin cities and frankly, unless Hannibal stopped that by a "scorched earth" policy, it would simply continue. I would do what Titus and Vespasian did to the Jews in their campaign that Josephus recorded- unless you have a firm state of supplies and a proper front, then there is no hope unless you decimate the enemy from within - this Hannibal failed to do.