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Pile o' Bones
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Air Power
Actually, the Nazgul on winged steeds were a new factor. It gave them speed and frightening power.
In THE HOBBIT, Smaugs aerial tactics were a real consideration.
The use of birds high overhead for surveilance could be like aerial reconnaisance.
And of course, the rescue of Frodo and Sam from Mount Doom, not to mention other tactical uses and advantages enjoyed by the Eagles comes to mind.
Of course, all allegories and analogies break down. It's just a fun mental challenge.
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