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Again, the book says the same thing. And they came out to "inspire" the dwarf troops. Besides, no one knew that eagles and a bear would fly in and crush everyone.

Thus, at least some intrigue (for those who are completely unfamiliar with Tolkien's work and haven't watched The Lord of the Rings) is lost. Of course, Tolkien is a great writer, but it would have been good to think a little more about what you are filming, because all the logic of what is happening is lost, and the battle becomes boring. Again, some anxiety was building up during the film (flying bats, Gundogan's army, Sauron, etc.), and then it just "pops" and that's it... Just some crowd (not particularly large) of masochistic orcs ran in, got hit, a pathetic death of one of the main characters, the end...