Haldir o Lórien wrote:
Personally I think that it would have punched a hole right through the story. Where would they put Arwen after the Battle of Helm's Deep? It's like if they let the entire Galadhrim live... they can't just return home and leave the others to go to another battle. And in that case, it worked well; the Galadhrim could be slaughtered - all of them - and the story would not be effected one bit, because their fate was never mentioned by Tolkien, which left Jackson free to take that to his advantage.
He could not have gotten rid of Arwen so easily though. She could not die, because her character is needed later on. And after the battle, she would never return home like a coward, and leave Aragorn to war elsewhere. It just didn't happen that way... Elves would never abandon while they were still able to help. And Arwen certainly would not... she loved Aragorn too much.
And wouldn't it be very odd if NONE of the Galadhrim lived... and only Arwen did? I would have been appalled.
I didn't know that all Galadhrim were killed during Helm's Deep as well. Of course, Haldir was killed and probably also some others, but I didn't imagine that the whole army was wiped out, also I always wondered where they might be...
@Lady Raine: I think if Arwen would have been at Helm's Deep she would have followed Aragorn to Edoras and Gondor. But I doubt whether she would still be in a condition to fight later, because in RotK her life is somehow bound to the fate of the ring after she gave up her immortality and she felt much weaker (the "If I could have seen him once more" -scene), so I guess she wouldn't have been able to fight after some time. She probably would have to stay in Rohan, but perhaps Aragorn wouldn't be willing to leave her in her present state of health and would have never gone to Gondor then...
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