Imperial-Renegade Dalek Civil War

The Imperial-Renegade Dalek Civil War was a civil war between two sides of Daleks - Davros's Imperials and the Dalek Supreme's Renegades.

Origins
The Daleks broke into two factions shortly after the creation of the Daleks and the destruction of the Kaled City. The Daleks realised that Davros was impure as he was not 100% Dalek and was not their leader, so they turned against him and exterminated him. (TV: Genesis of the Daleks)

However, Davros survived and his body remained under the ruins of the Kaled City. A group of Daleks decided that they needed Davros once again when the Daleks faced battle with the Movellans, so they allied with him shortly after he was woken by the Fourth Doctor. This created a faction of Daleks that felt loyalty towards Davros because he was their creator and had helped them. Nonetheless, the Doctor defeated most of the Daleks and had Davros frozen in suspended animation. (TV: Destiny of the Daleks) Davros was later taken to a prison station. (TV: Resurrection of the Daleks)

Rescue of Davros
Davros was later released by Gustave Lytton and his mercenaries who were being used by the Supreme Dalek. Shortly after being released from his prison, Davros learnt about the latest news about the Dalek-Movellan war, and he screamed in rage when he learnt the Daleks had been defeated with a bio-weapon after the Movellans had found a solution to the impasse created by the battle-computers on both sides.

Davros had a small injection device which could instantly convert humans and Daleks to his cause. He used this to build a small army of Daleks and human replicant troopers, then pitted them against the Supreme's forces with the mission to release the virus on the Dalek ship so he could begin anew. All of Davros' forces were destroyed, either by loyalist Daleks or the Movellan virus. During this time Davros planned to build a new Dalek race, and he told the Fifth Doctor about his mistakes in making them completely ruthless and unable to think illogically, and he decided to make them understand emotion, but only in order to make them better killers. (TV: Resurrection of the Daleks)

Necros
Davros escaped to the planet Necros, where he began creating a new army of Daleks from human tissue. The Daleks led by the Supreme Dalek were alerted to Davros' presence by Takis and Lilt, two employees at Tranquil Repose. The Dalek Supreme's forces considered Davros a criminal. When they arrived, a short engagement between Davros' and the Supreme Dalek's forces ensued. Following his capture, Davros attempted to reveal the Sixth Doctor to the Daleks, but he was not recognised by the Supreme Dalek's forces (who had encountered his previous incarnation). Davros was taken to be transported to the Dalek homeworld of Skaro to stand trial. (TV: Revelation of the Daleks)

Lethe
En route to Skaro, the ship carrying Davros crashed on the planet Lethe. Davros was rescued and set himself up as "Professor Vaso", altering the perceptions of the humans on the colony so they would not recognise him as the "Great Healer". He attempted to create a new machine, a Juggernaut based on a Mechanoid design.

Lethe's atmosphere prevented the Supreme Dalek retrieving Davros directly, but its forces intercepted the Sixth Doctor's TARDIS and forced him to serve as an agent of the Daleks to stop Davros' research and manipulations. The Doctor discovered two of Davros' Necros Daleks had survived the crash, but were destroyed following Davros' final gambit on the colony and the Supreme Dalek's intervention. (AUDIO: The Juggernauts)

The New Emperor
While on Skaro, the Sixth Doctor rescued Davros just before the Daleks carried out their sentence of death and spoke to him of his future destiny as Emperor Dalek. (COMIC: Emperor of the Daleks!, Above the Gods) The Doctor took Davros to Spiridon, where he could lick his wounds and bide his time. The Doctor intended to lay the groundwork for a Dalek civil war and spoke to Davros of his future destiny as Dalek Emperor.

When the grey Renegades led by the Supreme Dalek landed on Spiridon with the next incarnation of the Doctor, Davros set his army of white and gold Daleks (later known as the Imperial Daleks) against them, along with a Special Weapons Dalek. The Supreme Dalek died and in the aftermath of the battle, Davros found his wheelchair damaged. He suffered amnesia, remembering only his ambition to make himself the new Emperor. (COMIC: Emperor of the Daleks!)

Conclusion of hostilities
By the Shoreditch Incident, the Renegade Daleks were fragmented, with certain factions not engaged in the conflict with the Imperium; (PROSE: Remembrance of the Daleks) indeed, some of the Dalek Prime's Daleks, even after the war, were sympathetic to Davros's side. (PROSE: War of the Daleks) The Supreme Dalek at the time hoped to rally them by killing the Seventh Doctor. (PROSE: Remembrance of the Daleks)

The war ended after a final battle on Earth in 1963. Davros' Imperial Daleks defeated the Renegades with the aid of the Special Weapons Dalek. Further pursuing the plan he had already developed, the Seventh Doctor destroyed the Imperial Dalek mothership, and Skaro itself, using the Hand of Omega. The Doctor convinced the last of the Renegades on Earth to destroy itself by telling the Dalek that it no longer had a purpose. (TV: Remembrance of the Daleks)

The Daleks ultimately survived the Shoreditch Incident. Accounts disagreed, however, on which side could be said to have emerged victorious from the Civil War.

According to some accounts, the Imperial Dalek fleet was destroyed alongside Skaro and the mothership, (PROSE: War of the Daleks, AUDIO: Terror Firma) but another suggested that only Davros had been lost. Hence, the Imperial Daleks had simply elected a new Emperor before moving forward with Davros's long-held plan of moving against Gallifrey — thus beginning the Last Great Time War. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe) Yet a different account of the post-Shoreditch-Incident history of the Daleks suggested that Davros, sole survivor of the Incident, had created a new race of Imperial Daleks loyal to him, with him once more their Dalek Emperor, on Earth. (AUDIO: Terror Firma)

Another account, however, held that Davros awoke from stasis in his escape pod to find that Skaro was still whole and under the control of the Daleks of the Dalek Prime — those who had been designated Renegade Daleks during the Civil War, although, now that the "illegitimate" Emperor Davros was believed dead, they had reverted to calling themselves the true Imperial Daleks. The Dalek Prime further succeeded in weeding out those of his Daleks who, while genetically pure, were swayed by Davros's side politically. With Davros even being executed by the Prime's Daleks, the once-Renegades emerged the clear victors of the Civil War. (PROSE: War of the Daleks)