Neutronic war

From TARDIS Index File, the free Doctor Who reference.

A neutronic war is a war fought with neutron bombs, just as a nuclear war is 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". (DW: The Daleks, DC: Genesis of Evil)

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

The neutronic war was either a different conflict than the Thousand Year War, as it was said to have lasted only one day, or else legend replaced accurate history over time.