So you have a magician that can fly, the local population is on your side and you know your enemy needs the house you live in. Just let the magician fly everyone out in the middle of the night and set the mansion on fire. You could hide somewhere and strike your enemy while they don't know your location. The other side has basically declared absolute war, no need to hold back. Aim specifically for people, locations and events from the game, that should force the other side to act