In book of Lost Tales 1 (HoME Vol. 1) it says
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"Fankil and his host of Nauglath came upon the Ilkorin elves".
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Fankil is a servant of Morgoth who escaped the sack of Utumno. He was one of the first servants of Morgoth to try and corrupt mortal men. Dwarves fought allied to the dark lord at this time so they could have fought with Sauron.