Were they still men at that point or already ringwraiths? Why didn't they come to Sauron's aid during the battle of the last alliance? Just random thoughts.

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"Even darkness must pass. A new day will come. And when the sun shines it will shine out the clearer."

I am pretty sure they were already wraiths at that point but I do not have the exact date they first appeared. The were probably getting flogged by the elves from Lindon or were top general type things in other areas. Plus, I do not think that Sauron reckoned he would need their help since him getting beaten so unlikely.

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"Draw your sword with a heavy heart, but swing it with a heavy hand"

They first appeared in 2251 of the Second Age, nearly 1200 years before Sauron fell. I'd imagine they were marshaling the Orcs during the siege of Barad-dur, but also with so many powerful Elves and Numenoreans present they were likely outmatched in combat and their power of terror would have been less potent than in later ages.

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Gondor: 2339pts
Rohan: 1318pts
Dwarves: 2482pts
Elves: 1091pts
Mordor: 2305pts
Isengard: 1762pts
Moria: 1463pts
Evil Men: 381pts