Aragorn's mistake concerning the army raised from the Paths of the Dead

[Iarhen]

But effective or not, the army of the Dead would have proved a very needed support when the confrontation at the Morannon. Fear was indeed their biggest weapon, but not the only one.

Besides, Sauron would not control the army. Even though Gorthaur does indeed control a vast army of creepy creatures, and even though he controls the Nazgul and the Silent Watchers, it doesnt mean that he can control every phantom he knew about...

If he did, then the army of the Dead would not have supported Aragorn in the Pelennor, and certainly they would not have been imprisioned by the "mere" curse of a human king...

Besides, it was an army. An enormous force that proved to be the decisive force when the Pelennor... being dead, they cant be destroyed by the Dark Lord's army... And fighting against orcs, men and trolls without being destroyed would have proved victory for Aragorn and Co.