Of the Arming of the Noldor – Y.T. 1476-1478

June 10

And when Melkor saw that these lies were smouldering, and that pride and anger were awake among the Noldor, he spoke to them concerning weapons; and in that time the Noldor began the smithying of swords and axes and spears. Shields also they made displaying the tokens of many houses and kindreds that vied one with another; and these only they wore abroad, and of other weapons they did not speak, for each believed that he alone had received the warning. And Fëanor made a secret forge, of which not even Melkor was aware; and there he tempered fell swords for himself and for his sons, and made tall helms with plumes of red. Bitterly did Mahtan rue the day when he taught to the husband of Nerdanel all the lore of metalwork that he learned from Aulë.

[NOTE: Dates are approximate.]