The White Council assaults Dol Guldur?

[Legate of Amon Lanc]

Really, hewhoarisesinmight? That's indeed very interesting... if you have anything more you could add about that, I'd certainly like to hear about it... hmm... seems I have to try to somehow (well, yes, but how) obtain Morgoth's Ring and all those books as well...

Anyway, to the topic. Someone has said here that the answer to #7 is possible only as a speculation. Well, not actually:

Originally Posted by Chapter 2, The Council of Elrond

But Saruman has long studied the arts of the Enemy himself, and thus we have often been able to forestall him. It was by the devices of Saruman that we drove him from Dol Guldur.

So it was "by the devices of Saruman". Whatever evil elf-spirits might have been there, everything was accomplished by the devices of Saruman.

The only question is, what "the devices of Saruman" mean. I don't think only some "blasting fire" would be enough to drive Sauron off. Should "the devices" be interpretated only as "plans"? Or did he use some of the Enemy's devices, when he was studying them for so long? Not that the Council would allow him, for example, use Uruk-hai (of course he didn't have them yet at that time)... but maybe something more "subtle", like the "blasting fire", would be good...

Any ideas?