Adam Roberts:

But the thing that struck me is the way Gandalf comes back invulnerable. The last we see of Gandalf the Grey he is complaining that he is tired (‘what an evil fortune! And I am already weary’ [348]). Now he has almost limitless energy — when the four of them ride all day and all night across Rohan, Gandalf permits them only ‘a few hours rest’…. Not only does he not need sleep, he cannot be harmed by weapons: ‘Indeed, my friends,’ he tells his companions: ‘none of you have any weapon that could hurt me’ [516]. This carries with it the suggestion that all Gandalf’s subsequent battlefield galivanting with Glamdring is a kind of play-acting: for he can no more be slain than could Milton’s Satan. 

Adam is rarely wrong, as I’m sure he will confirm, but I think he’s wrong here. There’s a big difference between “none of you have any weapon that could hurt me” and “no weapon of any kind can hurt me.” Later he is openly uncertain whether he is a match for the Lord of the Nazgul — why couldn’t that encounter at least potentially end in his death again? I suspect that Adam thinks (confirm this for me, friend) that Gandalf could himself be transformed into a wraith, but if that’s what he’s in danger of, I suspect that Tolkien would have him say so.

But that’s just a suspicion — I’m not sure what could befall Gandalf. I just don’t believe we can say that he is “invulnerable” in any sense of that word I know. 

(By the way, in the movie of RotK, when Gandalf finally does confront that antagonist, Peter Jackson makes one of his very worst mistakes by having the Boss Wraith instantly destroy Gandalf’s staff, thus demonstrating absolute dominance over the wizard. It’s impossible to imagine that Gandalf, who has returned from death to fulfill his role as the Enemy of Sauron, could be utterly helpless before one of Sauron’s servants. Jackson then compounds the error by having the Wraith distracted from Gandalf by events on the battlefield: he immediately flies away rather than pausing for the four seconds it would clearly take him to destroy the staffless wizard whom he knows to be the leader of the rebels against the Dark Lord. It’s such a dumb scene.) 

I’m ignoring the main topics of Adam’s post, but I cherish that as my right. One further thing though: At the end Adam discusses Eomer’s complete ignorance of the existence of Lothlorien, though it’s almost on his borders. I wonder if this is meant to be an illustration in small of a more general phenomenon: the separation of the various peoples of Middle Earth, their withdrawal into “gated communities” with a consequent xenophobia. The leaders of Gondor are largely ignorant, and when not ignorant suspicious, of natural allies like the people of Rivendell; the boundaries of Lothlorien are closely guarded; the people of Bree rarely see travelers from the Shire; the dwarves of the Lonely Mountain don’t even know what has become of their kinsman Balin — and don’t seem especially interested, though they are curious. (How far is it from the Lonely Mountain to Moria? Maybe 600 miles? A goodly distance, but people in these books make such journeys fairly regularly.) We are often reminded that what’s called the Last Alliance of Men and Elves occurred thousands of years before the events of this book. The whole world seems to be afflicted by a mistrust of everyone except those who are definitively One’s Own People. There can be good reasons for mistrust, mind you, but not all of these folks act on good reasons.