Quote:
Originally Posted by
Shorty
"So, at any point, this army of the dead could have just come and wiped out the enemy, right?"
Quote:
Originally Posted by
Skyblade
They could have wiped Mordor clean on that same day. If they were going to fight more than one battle, why would they not stick around an extra hour or two and fight one more?
It's stated pretty explicitly in the books that the curse only bound them for one battle. In the books, there's only one they needed to fight in, at Pelargir, which gave them an effective way of transporting Northern reinforcements. There were more defenders at Minas Tirith in the book, so there wasn't much of a need for the Dead Army there. Maybe if they had not removed 90% of the country, things could be different.
The magic is also not strong enough to clean out Mordor. Consider the source of the level of sorcery required to keep these figures in check: a noble/king of Gondor cursing a few thousand men for about a thousand years, the source of which is dead, versus a Maia enslaving an army of living people on his own and maintaining nine Nazgul and their Rings of Power. It does not compare.