That sounds right. Especially at the end of Return of the King, during the Battle of the Morannon, when Sauron's "thought" was turned aside from his armies and bent fully upon what was happening in the Sammath Naur, his armies "faltered." So it was Sauron's thought alone that drove them onwards. Once he was concentrating completely on getting the Nazgul to the Sammath Naur in time, the Orc Armies had absolutely no idea what to do and were easily mowed down by the Army of the West.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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