I doubt they took slaves. What would be the point of having someone who would die three days later in the swamps? Plus, it was the Hist who lead the invasion, and I don't think the sentient and extremely ancient trees didn't want to dike around.

thanks for answers guys. sounds like the argonians are pretty pissed...

Was is just the argonians? I am sure there were a few human mercs aiding the lizards

Probably not. Considering the attack on Morrowind was likely led by the Hist's psychic control and not Black Marsh's political structure. If there were mercenaries and 3rd parties involved, they were more likely criminals and ethically bankrupt mercenary groups looting and pillaging the weakened Dunmer settlements. Still, there is no evidence for third party interference at this stage, and the high likelihood of Hist direction for the invasion decreases the chances that mercs were assisting the argonians.

Well I figured they could took Dark elves as slaves as long as they are found in Occupied Morrowind or parts of Black Marsh where non argonians could survive. Ofcourse I never read the infernal City. so They probably did just kill em all.

Reading from the Infernal City, it seems very implied they pulled a first era nord (kill everyone, leave no survivors). That, and it was only the argonians, controlled by the Hist, who probably have been planning for this day for many centuries.

Those Hist. Can't give up a grudge. I believe they're the ones responsible for Cyrus the Redguard's untimely death as well? All because he stole the a priceless gem from them. Lesson learned? Don't [censored] with psychic trees.

I agree with your anolysis.