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 Androids were prominent in Earth Empire society, but were viewed as an under-class. The Androids finally became fed up with the persecution and move en masse to the relatively unused Orion System. They proceeded to set up their own government, with the stipulation that Humans living in the system could stay if they accepted Android rule, or they could leave. The Earth Empire considered this a violation of sentient rights, and attacked the system to remove it from Android rule.

After 10 year of fighting, the War had reached a bit of a stalemate, although it was still being actively waged by both sides. 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 generations before. The Doctor stopped the agent from retrieving the Cyber-Technology and kept the reactivated Star Destroyer busy until it was destroyed by a local ion storm. (BFA: Sword of Orion)

Failing the effort to gather Cyber-Technology from Garazone, the Earth Military found another source, and attempted to create their own Cybermen for use against the Androids. However, it turned out to be yet another plot by the Cybermen themselves to take over Earth. Forces from the Earth Military narrowly avoided the Cybermen reawakening from their vaults in Telos. (BFA: Cyberman (audio series))

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