2150s Dalek invasion of Earth

In the second half of the 22nd century, the Daleks attacked Earth's colonies and invaded Earth and occupied it for about ten years.

Colony attacks
The invasion began in 2157 with mysterious attacks on Sifranos in the Arcturus sector (a moon of Sifranos was destroyed, one billion settlers being massacred), Azure, Qartopholos, (PROSE: Lucifer Rising) and Mars. (TV: Genesis of the Daleks) These were followed by the plague attacks directly on Earth while the Dalek Fleet massed near Epsilon Eridani. With the colonies destroyed Earth could expect no assistance from them when the Daleks invaded Earth in 2158. (PROSE: Lucifer Rising) The Daleks operated a blockade of the Solar system to prevent Earth's colonies from attempting to liberate their homeworld. The colonies experienced many problems from the occupation, as they were dependent, to a degree, on communication with and support from Earth. (PROSE: GodEngine, Lucifer Rising) Later in 2157, the Daleks attempted to invade Mars. However, the inhabitants developed a genetically engineered virus that attacked their spacecrafts wiring, meaning that this invasion attempt had failed. (TV: Genesis of the Daleks, PROSE: GodEngine)

Earth's invasion
The first incident of the invasion came in 2157, when Earth was bombarded with meteorites. At first this was thought the result of a cosmic storm, but shortly after things had returned to normal, people started dying of a new plague sent by the Daleks via the meteorites. The majority of the population of Africa, Asia and South America died before humans could find a cure. (TV: The Dalek Invasion of Earth)

Some humans were immune to the plague, because the Seventh Doctor had given to Piper O'Rourke a counter-virus that conferred immunity to make sure that there would be humans left to help his first incarnation defeat the invasion. (PROSE: Lucifer Rising)

Iris Wildthyme visited Putney Common during the invasion. A Dalek saucer landed on the Common, Iris and her friends were among the first to throw homemade bombs at it. (PROSE: From Wildthyme with Love)

At some point, New York City was completely destroyed. London, on the other hand, though one of the locations where the Daleks landed, was merely occupied and remained relatively intact (TV: The Dalek Invasion of Earth) although the city suffered some of the worst attacks since the Blitz and the 1944 V1 and V2 attacks by the Nazis during World War II, with the Daleks reducing many areas to gravel. (PROSE: Illegal Alien) Some areas of the city became infested with wolves, with a "danger zone" being identified wherein it was unsafe to live. (COMIC: When the Wolves Came)

The Daleks held the Earth for about ten years. During the occupation period, small groups of human resistance fighters continued to exist. (TV: The Dalek Invasion of Earth)

The Daleks commenced a mining operation in Bedfordshire in order to reach the Earth's magnetic core, replace it with a propulsion system, and turn the whole planet into a massive spacecraft. (TV: The Dalek Invasion of Earth)

Liberation
In 2167, (AUDIO: The Mutant Phase) the Daleks announced that they would destroy London. A freedom fighter named Dortmun, who had been developing explosives, initiated an attack on the Daleks' saucer at the London helipad. Although the attack liberated several prisoners of the Daleks, the bombs did not work effectively against the Daleks, leading to several casualties. Ian Chesterton, who had accompanied the freedom fighters, remained on the saucer as it travelled to Bedfordshire.

Following the saucer attack, the First Doctor, his granddaughter Susan and some of the resistance fighters who had been based in London (including David Campbell) travelled to the site of the Daleks' mining operation at Bedfordshire. Barbara Wright and Jenny also (independently) made their way to Bedfordshire, but were captured. They all, however, assisted in the final destruction of the centre of Dalek operations on Earth. In the aftermath, the Daleks withdrew from the planet. Susan decided to remain in this time period with David. (TV: The Dalek Invasion of Earth)

Aftermath
The invasion killed about two-thirds of Earth's population. The Moonbase was cut off from the planet and the moon colonists were trapped on the satellite. About thirty years later the liberation, humans had grown xenophobic about aliens, rejecting Dalek technology in public burnings and regressing the level of the planet's technology by about two centuries. An Earth Council was in charge, handling the reconstruction. (AUDIO: An Earthly Child)

By Steven Taylor's native time period, New York City had yet to be rebuilt in its entirety. (PROSE: Salvation)

Other references
Vicki Pallister learned about the invasion from the history books in her native time period of the 25th century. (TV: The Space Museum, The Chase)

Forced by Davros to reveal to him the Daleks' future defeats, the Fourth Doctor recounted an invasion of Earth, possibly an inaccurate version of these events. He stated that the invasion occurred in the year 2000 and that the magnetic properties of Earth's core itself helped to defeat the Daleks, as well as the determination of human resistance fighters. (TV: Genesis of the Daleks)

In 1903, after receiving a wealth of information from the future, Grigori Rasputin foresaw the First Doctor, Ian Chesterton, Barbara Wright and Susan Foreman battling "strange beings" who had invaded Earth in the future. (AUDIO: The Wanderer)

In the year 4000, when the Dalek Empire sought to strike from Kembel and destroy the Solar System, the First Doctor urged Bret Vyon to contact Earth and tell them to look into the invasion of 2157, hopeful that history would show them the way to defeat the Daleks again. (TV: The Daleks' Master Plan)

Alternate timelines
In a divergent timeline, a Dalek in 2158 Kansas, severely damaged by resistance forces, was stung by a parasitic wasp and implanted with eggs. The Daleks adjusted with a minor genetic change to counteract the eggs. Thousands of years later the genetic change resulted in the Mutant Phase, transforming the Daleks into nearly indestructible interstellar insects. The timeline was destroyed when the Fifth Doctor stopped the Dalek Emperor from implementing an ineffective pesticide. (AUDIO: The Mutant Phase)

In a timeline created when the Master used a conceptual bomb to prevent the Doctor leaving Gallifrey, the Dalek Invasion was never repelled. (AUDIO: The Light at the End)

Behind the scenes

 * The invasion possibly occurred during an earlier period of Dalek history, as the Daleks at this point had receiver dishes built into their casings to receive broadcast power for their survival. Other Daleks had relied on static electricity in the floors of the Dalek City (likely during an even earlier point in their timeline). (TV: The Daleks)
 * According to non-narrative material in DWBIT 1, six months after the initial incident, in 2158, the Daleks landed saucers on Earth. The Black Dalek led from the Command Saucer. One of these saucers attacked London. The British government put all their best defences into battle against the Daleks, sending the Air Force's helicopters and fighters to attack the Dalek ship. Tanks fought across the streets, and the Navy fought with gunboats. The humans were persistent, destroying many Daleks, but in a matter of days the Daleks subjugated the humans and converted the most intelligent into Robomen.

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