Scouring of Nebulos

The Scouring of Nebulos is an event from the Beast Wars: Uprising of the Generation 1 continuity family.

The Scouring of Nebulos was the final battle of the Great War, a destructive conflict that embroiled the planet Nebulos. Little is known about the specifics of this battle, but Fortress Maximus was one of the primary participants.

Judging by the name, Nebulos was probably not left in very good shape.

Fiction

IDW Generation 1 continuity

When Nebulos was threatened by Decepticons in 2031, the Autobots retaliated by transforming Cerebros into Fortress Maximus -- an awesomely powerful city-bot that took thousands of lives during the course of the Nebulan campaign. The destruction that he and his fellow city-bots wrought proved to be the final straw for the nascent Human Confederacy and its allies, who decided that the Cybertronian civil war was over and forcibly imposed an armistice on both factions. Fortress Maximus and the other Cybertronians responsible for the devastation were subsequently exiled back to Cybertron. Head Games Micro-Aggressions