TL

TL was a time scale used by the Time Lords. It was used in The Dalek Problem, a historical analysis of the Daleks by Qualen. (PROSE: The Dalek Problem)

History
In 70,092 TL, first contact was made between the Daleks and the Ogrons, who would become the Daleks' allies in many conquests and plots.

By 72,872 TL, the failure of the Deliavatsud Intervention had led to the Daleks being allowed to spread throughout Mutter's Spiral, leading them eventually to Temporal Nexus Point Earth. A major Dalek attack force easily overwhelmed the divided and quarrelsome nations of Earth at a time before the human inhabitants had developed technology capable of dealing with the Dalek threat. Ironically, the Dalek defeat was eventually brought about because the Daleks relied too heavily on Robomen for policing their conquered world. A human underground succeeded in disabling the central contro! for the Robomen and recapturing their world. Certain elements within the CIA seized on this incident as an excuse for promoting more ill-considered interventions, but cooler heads prevailed for the most part, and the CIA remained on a steady course of researching interventions thoroughly before proceeding with decisive action. In 73,208 TL, a major invasion of Mutter's Spiral was prevented by a Thal Revenge Squad that intercepted and destroyed the bulk of the Dalek army on the planet Spiridon.

In 73,314 TL, the last of the Exterminator Daleks was destroyed by Thal forces. The war left Skaro barren, however, and the Thals themselves abandoned it for more hospitable worlds.

In 73,508 TL, a Dalek attempt to spread a plague throughout Mutter's Spiral was blocked by the actions of certain Earth humans. The failure of this effort strengthened the position of CIA observers who called for a long period of study before initiating action against the Daleks.

Circa 74,480 TL, the Expansionist Daleks developed time corridor technology, thus giving them the ability to make limited intervention attempts in time. Though the time corridor was recognized as a potential threat, the CIA determined that the Dalek time travel device was nowhere near as efficient and versatile as even the crudest TARDIS devices. (PROSE: The Dalek Problem)