rate bravest moment. . .

[The Witch-King of Angmar]

Definitely Fingolfin challenging Morgoth.

""Then Fingolfin beheld (as it seemed to him) the utter ruin of the Noldor, and the defeat beyond redress of all their houses; and filled with wrath and despair he mounted Rochallor his great horse and rode forth alone, and none might restrain him. He passed over Dor-nu-Fauglith like a wind amid the dust, and all that beheld his onset fled in amaze, thinking Orome himself was come; for a great madness of rage was upon him, so that his eyes shone like the eyes of the Valar. Thus he came alone to Angband's gates, and he sounded his horn, and smote once upon the brazen doors, and challenged Morgoth to come forth to single combat. And Morgoth came."(The Silmarillion) That was the last time in those wars that he passed the doors of his stronghold, and it is said that he took not the challenge willingly; for though his might was greatest of all things in this world, alone of the Valar he knew fear. But he could not now deny the challenge before the face of his captains; for the rocks rang with the shrill music of Fingolfin's horn, and his voice came clean and clear into the depths of Angband; and Fingolfin name Morgoth craven, and lord of slaves. "Therefore Morgoth came, climbing slowly from his subterranean throne, and the rumour of his feet was like thunder underground. And he issued forth clad in black armour; and he stood before the king like a tower, iron-crowned and his vast shield, sable unblazoned, cast a shadow over him like a storm cloud. But Fingolfin gleamed beneath it like a star; for his mail was overlaid with silver, and his blue shield was set with crystals; and he drew his sword Ringil, and it glittered like ice, cold and gray and deadly."