system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] why are the Dead Marshes cursed?

I haven't read the books in forever, but is there a reason why the marshes outside Mordor are cursed by ghosts?
gpt
The main battle of the War of the Last Alliance was fought there, before the Black Gate. It lasted months, but in the end the armies of Gil-Galad and Elendil broke the armies of Sauron, enabling them to enter Mordor and beseige Barad-dur.

The ghosts are the spirits of the many thousands slain.