What we really need to find is a medieval equivalent of an anti-arcraft gun, and so I think this may work:
Take a ballista and mount it on a swiveling platform, then make it so it can be angled up and down. This should be able to take a Fell Beast out with one shot, providing Gondorian soldiers can aim the thing well.
Oh, as an alternative tactic one could try to shoot the ringwraiths on their backs with flaming arrows (as I recall, the Nazgul did not particularily like being set on fire...)
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