Board Thread:Lore Discussion/@comment-24256580-20131206011928/@comment-1600847-20140112204308

Zippertrain85 wrote: Well, you certinaly give people who question lore a hard time.

It's been said numerous times how Black Marsh is full of Poisones diseases, and how the Argonians are such good warriors, and how the animals are deadly, and how there are waterways that you could drown in, that they have the power of the hist on their side, that they have the power of Sithis and their side. With all of this in mind it's hard for me to believe that some Dunmer could just go in and enslave them like that. It goes against everything we're told about Black Marsh.

About House Dres talking slaves from the North, very little of Black Marsh's population live on the boarders, so that gives them access to maybe 10 - 15% of the population. Even then if they went into Black Marsh like that the government would consider it an invasion from Morrowind and attack them. Not to mention, if they cought a disease it could wipe out the entire population. If you check the Inetractive Map of Tamriel of TES: O's website, one of the features of Shadowfen is "Note found on the corpse of a House Dres slaver" detailing how the Argonians plan on fighting the slavers.

So we have quite a bit of evidence that the Dunmer did indeed raid northen Black Marsh for Argonian slaves. And even if it's only 10-15%, it's still slavery, it still would've been ample motivation for the invasion.