Four Score War: 1E 2840 - 1E 2920
Dagoth Ur awakening: 2E.
Reman is a mortal, with mortal-only generals, who thrashed Vivec, the ALMSIVI and the entire Dunmer nation on the field of battle, without Vivec having the excuse of Dagoth Ur eating his homework.
I was talking about the deal with Tiber Septim... Not the deal with the Reman Empire...
Also Vivec lost a fortress because of bad intelligence, he did not lose a single battle in the 2920 books. After 80 years Morrowind was still busy defending her borders, they never expanded into Cyrodiil or wanted too, meaning that in 80 years of battle the Empire had managed to actually win ONE whole fortress... By tricking Vivec, arguably that's more impressive then beating him on the battlefield, but don't make it sound like he got trashed constantly. Because that simply isn't true.