This is from... quite a while ago (September) but it's been nagging at me for a while, and it's relevant now, somewhat, given that we've maybe/possibly got Morghur here again, and I'm sorry if this is nitpicking on my part, but I can't really help it-
The High Elves weren't at the Battle of Arden? There's no mention of them being there? They fought alongside the Wood Elves against Beastmen, but that was 6 years later, under the timeline heading "Slaughter at Bleak Meadow". If you're infering that they were also involved at the Battle of Arden, given the relatively close proximity in terms of the timeline, then far enough on that front, but there's no textual reference I've seen that places them there.