I only saw the PJ movies once, so my memory of the scene is (thankfully) hazy.
The book, however, seems to indicate the Dead, like the Nazgûl, relied primarily on the dread that accompanied them to achieve victory.
Gimli described the scenario:
Quote:
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'Pale swords were drawn; but I know not whether their blades would still bite, for the Dead no longer needed any weapon but fear. None would withstand them.'
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ROTK The Last Debate
Since they were
dead, unlike the Ringwraiths, they should not have still had physical bodies. That would preclude any ability to actually fight.