Quote:
Originally Posted by Morsul the Dark
Gandalf was always working to fortify the West and North from Mordor. That’s a big reason he moved to put Thorin and company back into the lonely mountain. The biggest reason I can think of about the difference is Gandalf before Bilbo is working against a hypothetical threat. In LoTR it’s no longer hypothetical and a full blown crisis
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At the time of the
The Hobbit, Gandalf had known for nearly a hundred years that the Necromancer was Sauron. It took the latter reoccupying Mordor, and, even more so, the knowledge that the ring Bilbo had found was the One, to convince him that the last throw was almost at hand.