User blog comment:Zippertrain85/Harkon's backstory?/@comment-121.219.169.69-20130518100414

Not much is known about Harkon's time. Pelinal was said to have conquered and held large pieces of land.

And supposing that he was particularly powerful, there would nothing stopping him from sending his soldiers to round up these thousands and then having them routinely killed. Hitler had such a thing done, albeit on a much larger scale. Harkon never mentions it was all done in one foul swoop. It could have been kill "300 this day, kill another 300 the next," and so forth.