: Well, Elrond sent an army to the final battle with Angmar, which occurred a year after the fall of Arthedain. The only large departures of Elven folk we know of from that time forward were the flight of the Silvan Elves from Lorien in 1981 and the flight of the High Elves near the end of the Age.
IIRC, wasn't it described that Elrond sent a "force" from Imladris under Glorfindel? I always had the impression that Elrond's "force" was relatively small. But even a small force that hits the rear by surprise can do tremendous damage.
: Well, there is really no answering your question. We don't know what the Rangers were up to while Aragorn and the Hobbits made their way toward Rivendell.
Rumor has it some were still running from Sarn Ford . Russ