[Maédhros]

I wonder if we could use this:
From the Shibboleth of Fëanor

She perished in the crossing of the Ice; and Turgon was thereafter unappeasable in his enmity for Fëanor and his sons. He had himself come near to death in the bitter waters when he attempted to save her and his daughter Itaril, whom the breaking of treacherous ice had cast into the cruel sea. Itaril he saved; but the body of Elenwë was covered in fallen ice

Is it better to use this in this part or better to use it in the respective chapter when the host of Fingolfin was crossing the Helcaraxë.
How about this:

§ 20 Now Tuor learnt < TO that there was no Queen of Gondolin because the wife of Turgon, Elenwë, was lost long before in the crossing of the Helcaraxë by the host of Fingolfin, <SF [where Turgon] had himself come near to death in the bitter waters when he attempted to save her and his daughter {Itaril} [Idril], whom the breaking of treacherous ice had cast into the cruel sea. {Itaril} [Idril] he saved; but the body of Elenwë was covered in fallen ice; thereafter [Turgon was] unappeasable in his enmity for Fëanor and his sons.>> [This and] many [other] things in those realms [were] taught by Voronwë whom he loved, and who loved him exceeding greatly in return; or else was he instructed by the skilled men of the city and the wise men of the king.