The Daleks were a species that the Eighth Doctor described as "machine-monsters". (PROSE: Interference - Book One) The history of their empire was constantly changing (PROSE: Alien Bodies) due to an incident in which the Doctor tricked them into tangling their timeline so bad that their history collapsed under the weight of the temporal paradoxes. (PROSE: Unnatural History)
History
On one occasion, a Dalek scout ship crashed in the desert of Hyspero, where it was set on fire by the Four. (PROSE: The Scarlet Empress)
Prior to the beginning of the War, the Daleks attempted an invasion of Gallifrey. (AUDIO: The Apocalypse Element, PROSE: The Ancestor Cell)
The Daleks invaded Earth in the 2160s. (TV: The Dalek Invasion of Earth) The Daleks first attacked in London, and though some local politicians sealed themselves in the Parliament buildings, they were "exterminated". Marie described their spaceships as "little toy saucers". (PROSE: Alien Bodies) They occupied Earth for a decade, keeping humans in work camps to dig to the center of the Earth. (PROSE: A Star's View of Caroline, TV: The Dalek Invasion of Earth) The caldera at Earth's core would allow them to change history. (PROSE: Interference, Head of State) Izzy Ring described them as "fat, metal beetles". After the Explosion, they all went crazy (screaming "Ulla, ulla, ulla!") and died, their shells cracked and their flabby bodies dessicated (PROSE: A Star's View of Caroline)
Involvement in the War
Two Daleks were invited to the auction for the Relic. However, a Kroton invaded their craft and took their place. (PROSE: Alien Bodies)
The Daleks were the first major power to enter the war with the inhabitants of the Obverse after its formation. (PROSE: The Blue Angel)
Chris Cwej made a treaty between the Great Houses and the Daleks that involved giving them time travel technology. (PROSE: Dead Romance)