@hawkeye10,
Well first when you start to used weapons of war no matter how smart those weapons happen to be civilians are going to be in harm way and I would bet a large amount of funds that those food supplies was going to keep the army in the field more then feeding the population of the city.
In any case, the best way is to used overwhelming force and get the conflict over in as short a time frame as possible something the West is not willing to do because of people like you crying over it.
Al Hamilton said in relationship to putting down the whiskey rebellion when the government need to used force to imposed it will the best manner of doing so is for the government to come on as a Hercules. The farmers in that conflict took one look at the forces coming in their direction and surrounded.
US Grand said we had been fighting this war “US civil war” for a numbers of years with great lost of lives on both sides but with little results and now I am going to spend whatever resources I need to in order to end this conflict.
He went on to prove his willingness to keep this word when in one battle he lost more men in an attack on Lee then Lee total forces facing him and instead of withdrawing he keep pressuring Lee until Lee needed to retreat.
There is no nice and clean way of using force and when you decide to do so the best and cheapest way in terms of total lives lost on both sides is to come down like the hammer of god.