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I don't think Saruman is as cunning a commander like the Witch King, so he probably wouldn't be that great at amassing a great army like Mordor. But Saruman was prepared to betray Mordor all along at all costs to save the Ring. Rohan & Gondor would not have faught alongside Isengard, rather they would have attacked Mordor at the latter stage of the battle when the Mordor army was shaken up & disorientated to an extent. Isengard afterall had a ferocious army, if somewhat small.
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