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Sauron: Wizard Gandalf
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Sauron remained in Dol Guldur for the time being, and his power grew. The Wizard Gandalf the Grey began to suspect that the Necromancer of Dol Guldur was in fact Sauron returned. Gandalf went to Dol Guldur in 2063 to investigate, but Sauron fled into the east and remained there for several centuries. For a time there was a Watchful Peace which ended when Sauron returned to Dol Guldur with even greater strength in 2460.
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[O]f all, if the terrorists are Sauron and the U.S. hobbits, then who the heck is Saruman? The Fighting Uruk-hai? Gollum? Where is Mount Doom? How does Gandalf fit in here, and what does Tom Bombadil really stand for?
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Gandalf utterly rejected Sauron's terms and the Battle of the Morannon began. The odds were overwhelming: Sauron's army was more than ten times greater than that of the Host of the West. Sauron seemed assured of victory.
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In The Two Towers, Saruman raised a vast army on Sauron's behalf and invaded Rohan. With the help of the giant tree-herders of Fangorn forest, Gandalf and the Ents, led by Treebeard, defeated Saruman's armies. His stronghold at Isengard was overthrown and Saruman was trapped within the Tower of Orthanc.
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Wizard Gandalf