23... “How can Satan drive out Satan? 24If a kingdom is divided against itself, that kingdom cannot stand. 25 If a house is divided against itself, that house cannot stand. 26 And if Satan opposes himself and is divided, he cannot stand; his end has come. 27 In fact, no one can enter a strong man’s house and carry off his possessions unless he first ties up the strong man. Then he can rob his house. 28
Mark 3:23-28
Yep, no matter what happens in such a confrontation, you still end up with a devil occupying the place. God has to occupy it to force all devils out. Still, the infighting between devils can be very, er, interesting.