User blog comment:Madgod21/The Thalmor/@comment-184.155.221.161-20111125181618

I've heard from snippets in conversation that the Thalmor completely overran Black Marsh by boiling the swamps... not cool. They can all die for all I care, I'd personally see to the deaths of a few hundred of them myself.

By the way, I don't REALLY know if they overran the Black Marsh, all I know is that something happened, and judging by the way the rest of Tamriel is, Black Marsh probably put up one hell of a fight before the Thalmor boiled everything. Just a hypothesis, though.