I think that Elrond saw the gathering of the forces in western Beleriand. We do not have much information about the course of the war of wrath, but some sources name a camp on the former watched plain (between Narog and Taiglin), were Enowe summoned alle willing forces to his banner.
What is said about the Elves of Beleriand in the Silmarillion does in my view only count for the last battle in which the forces of Angband were destroied and Morgoth himself at last take captive again.
Respectfully
Findegil
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