Mechonoid Incident

The Mechonoid Incident was the Time Lord designation for the event in which the Daleks pursued the First Doctor and his companions through time. (TV: The Chase, PROSE: Dalek Combat Training Manual) One journalist later suggested this incident to be the first skirmish of the Last Great Time War. (AUDIO: The Dalek Conquests)

The Black Dalek ordered a squad of Daleks to hunt down the First Doctor using a time machine in revenge for his role in the liberation of Earth in the 22nd century. The ensuing pursuit across time encompassed numerous planets and time periods, culminating on Mechanus where the Daleks engaged the native Mechanoids in battle. (TV: The Chase)

Prelude
On his early travels, the First Doctor became a recurring enemy of the Daleks, (TV: The Daleks, AUDIO: Return to Skaro) notably being instrumental in the overthrow of their occupation of Earth in the 22nd century. (TV: The Dalek Invasion of Earth)

The Daleks developed time machines of their own, however these early time machines relied on taranium creating a means of time travel that, while impressive, was highly unstable, (PROSE: The Chase) and expensive to use. (PROSE: Mission to the Unknown, The Mutation of Time)

Following the failure of the Daleks' plot with, the Gold Dalek orchestrated a new invasion of Earth using time travel. Though this invasion failed, it inspired the Black Dalek to use time travel. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)

Conflict
The Black Dalek tasked a squad of Pursuer-Daleks with hunting down the Doctor. (AUDIO: The Daleks) They located him on the planet Aridius, along with his companions Barbara Wright, Ian Chesterton and Vicki Pallister. The Doctor and Barbara learnt of the Daleks' imminent arrival via the Time-Space Visualiser which showed them the Black Dalek issuing its commands to the assasins. (TV: The Chase)

Aftermath
The Dalek Conquests put forward that this incident was the "first skirmish" of the Last Great Time War between the Time Lords and the Daleks. (AUDIO: The Dalek Conquests) It was during the war that this incident, among others, was tactically assessed by the Time Lords, who learnt that Dalek time capsule technology was more sophisticated than first thought; not only were they capable of precise navigational control, but they also seemed to be able to track our Gallifreyan time capsules with ease. The Time Lords lamented Ian and Barbara's destruction of the Dalek time machine, which deprived them of an opportunity to study Dalek time technology. Technical teams were dispatched to look for ways to block the temporal signature of all operational TT capsules in order to prevent the Daleks from tracking them. (PROSE: Dalek Combat Training Manual)