Old circular firing-squad gag

The "old circular firing-squad gag" was how Dalek Caan described (PROSE: Dalek Caan) the side-effect of the relocation of the planet Gallifrey at the end of the Last Great Time War by all incarnations of the Doctor and the TARDIS. As the planet had been subject to orbital bombardment by the assembled Dalek Fleet, its sudden disappearance perceived by the Daleks in their slower gradient of time, caused them to be inadvertently caught in their own crossfire, resulting in the destruction of the vast majority of the Dalek forces and rendering their species near-extinct. (TV: The Day of the Doctor, PROSE: The Day of the Daleks)

While other Dalek survivors escaped elsewhere, (PROSE: Dalek, TV: Doomsday) the Dalek Emperor would explicitly recall that his ship survived the Doctor's "inferno", albeit crippled, before falling through time and emerging in the post-Time War universe. (TV: The Parting of the Ways) Dalek Caan, who successfully bypassed the time lock protecting the war's events to enter the first year of the Time War, saw the event among many others as he was exposed to time. (PROSE: Dalek Caan)