Orion War

The Orion War was a conflict or series of conflicts that took place in the Orion System in the 26th century, between androids and humans.

History
By the early 26th century, androidss were commonplace in Earth Empire society, but were viewed as an under-class. The androids finally became fed up with the situation and moved en masse to the relatively unused Orion System. They set up their own government, with the stipulation that humans living in the system could stay if they accepted android rule. The Earth Empire considered this a violation of sentient rights, and attacked.

After ten years of fighting, the war had reached a stalemate. In order to break the stalemate, the Earth Military sent an agent to the Garazone System to retrieve Cyber-Technology from a derelict Cyberman Star Destroyer left behind by the Cyber-Wars a generation before. The Eighth Doctor stopped the agent from retrieving the technology and kept the reactivated Star Destroyer busy until it was destroyed by a local ion storm. (BFA: Sword of Orion)

The Earth Military found another source, and attempted to create their own Cybermen to use against the androids. It turned out to be yet another plot by the Cybermen to take over Earth. Forces from the Earth Military narrowly avoided the Cybermen reawakening in their vaults in Telos. (BFC: Cyberman)

While the tide of the War definitely favoured the Androids, the resolution of the war has not been revealed.