Join Date: Jan 2012
Location: That place, you know. That place you went to that one time, surely you remember?
Repeat the above strategy and then take whatever valuable resources you can salvage from the burning ruins... If the valuable items are breakable, swap nuke/carpet bombs for violent gas attacks and smoke bombs, lasting from 48-72 hours. Then move in, take valuables and use the original strategy. Or, if the items are non-flammable, fill the area with flammable gas, then ignite the area, killing all inside.
If you want the castle, use the highly radioactive material left after the thorough nuking, sell it, then commission the creation of a new, better fortress.
Then, in the unlikely situation that there are survivors or relatively undamaged corpses, parade them through the streets of nearby towns and cities as an example, thereby dissuading any thoughts of attack.