Final Fixes Reborn, not Final Fixes. (The original Final Fixes was an effort to fix, patch, etc. Rise from Erebus. That petered out and was restarted as Final Fixes Reborn, which morphed into Ashes of Erebus, although the name of the thread stayed the same.)
Civ 3 had separate Attack and Defense Strengths for many (most? all?) units -- I don't remember exactly, since it's been a long time since I played Civ 3. Kael decided pretty early on in the development of FfH2 -- again, I don't remember exactly when -- to bring back that idea, so that's what you're seeing.