§ Of the Return of the Noldor The Silmarillion

But even in the hour of the death of Fëanor an embassy came to his sons from Morgoth, acknowledging defeat, and offering terms, even to the surrender of a Silmaril. Then Maedhros the tall, the eldest son, persuaded his brothers to feign to treat with Morgoth, and to meet his emissaries at the place appointed; but the Noldor had as little thought of faith as had he. Wherefore each embassy came with greater force than was agreed; but Morgoth sent the more, and there were Balrogs. Maedhros was ambushed, and all his company were slain; but he himself was taken alive by the command of Morgoth, and brought to Angband.