*You have been warned

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The only thing from RotK that confused me was the Eagles when they came and "evened up" the battle at the gates of Mordor. They basically came out of nowhere and as far as I know, they were never talked about in the other 2 movies. I haven't read the books yet, so there is a possibility they were talked more in the books. So can anyone explain the Eagles to me? That's about the only thing in the movie that confused me.