Cyber-Wars

The Cyber-Wars was a galactic conflict in which an alliance made a concerted effort to wipe out the Cybermen.

Origins and the Conflict
The conflict began in 2526. (TV: Earthshock) A force of time-travelling Cybermen from the end of the conflict attempted to prevent the war. They tried to destroy the Earth, first with a Cyber-bomb and then by crashing a human freighter into the Earth to prevent the alliance who planned to fight them from forming. Both of these attempts were stopped by the Fifth Doctor. (TV: Earthshock)

It was during this conflict that the glittergun was developed. Gold was a major weakness of the Cybermen. The gun could fire gold dust at them. (TV: Revenge of the Cybermen)

The wars resulted in near-complete destruction of the Cyber race. Remnant groups of Cybermen fled across the galaxy. One remnant group attempted to retaliate by destroying Voga, the planet of gold but were destroyed when the Fourth Doctor instructed the Vogans to fire their rocket at the Cyber-ship. (TV: Revenge of the Cybermen)