You see, you should never spare civilians, they merely go on to support the trolls. They can't help it, they're feeble peasants, and trolls are monsters putting them in a fright. Keep the war to the warriors and kill the rest. Or at least take them prisoner. Do something, you know, or else you end up with either a lot of controlled peasants or a lot of... free peasants, and we all know how that goes.