Brazen War
The Brazen War was the physical conflict between incarnate angels and the Watchers' allies that occurred after the Great Flood.
Summary
When the Flood failed to kill all of the Nephilim, Yahweh commanded an army of angels (primarily erelim, but also ishim, malakhim, and possibly other orders) to incarnate on earth and attempt to kill the surviving Nephilim and the mutu lovers and allies of the Watchers. The angelic army was eventually driven back and defeated by the Watchers, Nephilim, and allied mutūma, with the assistance of Satanael.
Outcome
Despite significant casualties, the Nephilim were not exterminated in the Brazen War, and their lineages survive to this day. The teachings of the Watchers also persisted, despite physical, spiritual, and intellectual efforts by Yahweh and his servants to stamp them out.