Thousand Year War

The Thousand Year War was the major war fought between the Thals and Dals, which lasted for an unknown amount of time.

Origins
The origins of the war and the reasons why the races were fighting were unknown by the time of Davros, as had how long the war had been fought, so the two races kept of fighting just because it was what they did. However, some of the beginnings of the war are known, or believed to be known.