What is the name of the great battle called the Battle of Unnumbered Tears in Tolkien’s mythology?

The Battle of Unnumbered Tears in J.R.R. Tolkien’s mythology is called Nirnaeth Arnoediad.

Nirnaeth Arnoediad is a major battle in the First Age of Middle-earth, fought between the forces of the Noldorin Elves and their allies and the armies of Morgoth. Tolkien presents it as a disastrous attempt to break Morgoth’s power. The defeat causes the collapse of the great alliance and leaves many northern realms exposed.

The battle is especially important because betrayal and broken hopes shape its outcome. The Easterlings, who had appeared to support the Elves and Men, turn against them during the fighting. Húrin is captured after the battle, and his fate becomes central to later tragedies, including the story of his children. The name is usually translated as “Battle of Unnumbered Tears,” while Dagor Bragollach refers to an earlier conflict, the Battle of Sudden Flame.