[eleanor_niphredil]

"Many faces proud and fair, and weeds in their silver hair.But all foul, all rotting, all dead. A fell light is in them." Frodo hid his eyes in his hands. " I know not who they are; but I thought I saw there men and elves, and orcs beside them"
"Yes, yes" said Gollum "All dead, all rotten. Elves and Men and Orcs. the Dead Marshes. there was a great battle long ago, yes, so they told him when smeagol was young, when I was young before the precious came. A great battle. tall men with long swords, and terrible Elves, and Orcses shrieking. they fought on the plain for days and monthes before the black gate. But the Marshes have grown since then, swallowed the graves; always creeping, creeping"

So now you know.