§ Of the Sindar The Silmarillion

Therefore Thingol took thought for arms, which before his people had not needed, and these at first the Naugrim smithied for him; for they were greatly skilled in such work, though none among them surpassed the craftsmen of Nogrod, of whom Telchar the smith was greatest in renown. A warlike race of old were all the Naugrim, and they would fight fiercely against whomsoever aggrieved them: servants of Melkor, or Eldar, or Avari, or wild beasts, or not seldom their own kin, Dwarves of other mansions and lordships. Their smithcraft indeed the Sindar soon learned of them; yet in the tempering of steel alone of all crafts the Dwarves were never outmatched even by the Noldor, and in the making of mail of linked rings, which was first contrived by the smiths of Belegost, their work had no rival.