That is not the only unknown in the books. The army of the West would not enter Minas Morgul, partially because of the need for the safety of Frodo, but also because of
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The evil that dwelt in that valley, where the minds of living men would turn to madness and horror
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My guess would be that Sauron must have employed some Maiar, lesser than him, which he placed at key locations to reinforce his strength.
[ March 12, 2003: Message edited by: Meoshi ]