Great War

The Great War (グレートウォー, Gurēto Wō) was the first and most violent outburst of fighting which started on the planet Cybertron, where the Autobots wage their battles to destroy the evil forces of the Decepticons.

History
The Great War is known by some chroniclers of Cybertronian history as the Third Cybertronian War. It was during a time of peace known as the Golden Age of Cybertron that Megatron re-organized the Decepticons for the purpose of challenging the Autobots for control of Cybertron.