In any case, the assault on Dol Guldur wasn't much of an assault. Sauron had already left and arrived in secret in Mordor a couple of years earlier. There is no record of there even being a battle at Dol Guldur when the White Council attacked. Sauron had long planned his return to Mordor.
I think we'll agree that without Sauron there, it's pretty easy for Gandalf, Saruman, Galadriel, Elrond, etc. to take the fortress, with or without Elven-rings.
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"If you're referring to the incident with the dragon, I was barely involved. All I did was give your uncle a little nudge out of the door."
THE HOBBIT - IT'S COMING
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