Yeah, but Dol Guldur was one dangerous place. I mean, Elrond, Gandalf, Galadriel, Glorfindel, and all the other powerful good guys knew of its existence for quite a long time, and yet were unable to drive out 'The Necromancer'. They simply didn't have the power to.
Though, when I think about it, sneaking into a place is a lot different then driving out Sauron...
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