A lot of dunmer fled to west after the eruption of the Red Mountain.
Did they fight in the Great War? What about the betmeri inhabitants of the Empire?
Thank you.
Unknown question.
Its possible that some of them got dragged into the war, but not in any noticeable way that would credit them with a mention in later texts. Its also important to note that these people were refugees seeking shelter from a series of terrible events... I doubt they would want to fight.
I imagine that Dunmer who were native to Cyrodiil(and other places on the war front) fought.
Don't expect the Dunmer to fight, or even care about the Great War. The one and only threat to them at the moment are the pissed off Argonians who want revenge. Don't expect either of the two to play a part in the next Great War. They'll be too busy killing each other.
Probably for the best, especially after the way the Argonians and Hist dealt with the Daedra...
They'd try, but the Dunmer will likely refuse. Empire animosity + threat of Black Marsh. Though I'm sure there are Dunmeri legionnaires for what it's worth.