[Tuor of Gondolin]

Interesting Dol Guldor theory, But wasn't it destroyed by the
White Council? On the other hand, orcs were clearly still in force
in much of the Misty Mountains, to send forces to join in
attacking the Fellowship.

And it's rather remarkable to consider what is actually
potentially the geopolitical centrality of Orthanc at what seems
at first glance an insignificant backwater. Perhaps Saruman's
policies weren't as ridiculously improbable as they seem in retrospect,
even if the Ring had remained hidden- or dispatched into the deeps of
the ocean, as was suggested at the Council of Ricendell.