Neutronic war

A neutronic war was a war fought with neutron bombs, just as a nuclear war was a war fought with nuclear weapons. A neutronic war was fought between the Thals and the Humanoid Daleks, which led to the mutation of both races and the creation of the non-humanoid "machine Daleks", and the ravaging of their homeworld, Skaro. (TV: The Daleks, COMIC: Genesis of Evil)

Accounts differ as to the reasons for the war. According to one history recorded a long time afterwards, the war was deliberate. (TV: The Daleks) According to another, the detonations of the neutron bombs were an accident caused by a meteorite strike. (COMIC: Genesis of Evil)