2150s Dalek invasion of Earth

The First Dalek War was the first war between the Daleks and Humanity.

It began in 2157 with mysterious attacks on Sifranos in the Arcturus sector (a moon of Sifranos was destroyed, one billion settlers being massacred), Azure, and Qartopholos. These were followed by the plague attacks directly on Earth while the Dalek Fleet massed near Epsilon Eridani. The war would properly being in 2158 when the 22nd century Dalek invasion of Earth commenced. (NA: Lucifer Rising)

Additionally, the Thals referred to the period in their history (after the the Doctor helped them rise up against the Daleks) as the First Dalek War. (DW: The Daleks, Planet of the Daleks) It is possible both events were conducted simutaniously by the Dalek Empire.

Behind the scenes

 * The human conflict known as First Dalek War has not been mentioned in any media and can only be distinguished due to references to a second and Third Dalek War.