2150s Dalek invasion of Mars

A Dalek invasion of Mars occurred in 2157. (PROSE: GodEngine, Beige Planet Mars)

The Invasion
The Daleks invaded Mars while on their way to Earth. Colonists fought back and, with the help of the Ice Warriors, created a virus which ate away at Dalek cable insulation. The Dalek forces were driven away from the colony and decided just to focus on the Earth. (PROSE: The Dalek Invasion of Mars)

The invasion saw the Daleks destroying the Martian city of Marventos as well as creating Robomen. The Martian government held on long enough for the Minister of Space Defence, Zavarim L., to issue a "Dalek Defence Drill" poster advising his citizens on how to best survive. (PROSE: What To Do If A Dalek Attacks You!) An old man and a teenage girl from another world helped fight off the invasion. (PROSE: Beige Planet Mars)

While being interrogated by Davros in an agony seat during the Genesis Incident, the Fourth Doctor recounted that on Mars, the Daleks were defeated by a virus that attacked the insulation on the cables in their electrical systems. (TV: Genesis of the Daleks) According to one historical account, this invasion was part of the conflict following the Time Destructor Incident of 4000, contemporary to the Dalek invasion of Venus. (PROSE: The Whoniverse)

Aftermath and legacy
Mars was again attacked by the Daleks during their war with humanity in 2545, before they were driven off-world in the Battle for Mars. The 50th anniversary of the battle was recognised in 2595, also the 500th anniversary of Earth's colonisation of Mars. Bernice Summerfield observed that the battle was only the third war on Mars in a period of about 500 years, following the 2157 Dalek invasion and the Thousand Year War from 2086 to 2088, which she deemed a "pretty good tally" compared to Earth history. (PROSE: Beige Planet Mars)