A point of clarification is in order: the Oathbreakers never came to the Pelennor. Aragorn released them after they frightened off the defenders at Pelargir. It is probably no stretch to assume that the dead would make lousy crewmen for a fleet, and in any case, would make it impossible to bring living allies along, as that Shadow Army had the pesky tactical drawback of scaring the wits out of friend and foe alike.
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