Breach of the Dalek data core

The Time Lords understood that the Dalek data core was breached by the Eleventh Doctor, who used a damaged New Paradigm Supreme Dalek to provide him with information about the Silence. (PROSE: Dalek Combat Training Manual) The Doctor had done so by accessing the Dalek's personal data core, located within its casing, to learn "everything the Daleks know about the Silence". (TV: The Wedding of River Song)

In their record of Dalek activity in linear history, the Time Lords indicated that the Dalek in question was active in the "far future", the time of the New Dalek Paradigm following the pre-Time War Hand of Omega Incident, which itself followed the 47th century Necros Incident. The breach itself was followed by the Asylum Incident, (PROSE: Dalek Combat Training Manual) in which the Dalek Asylum was destroyed. By that point, one of the Dalek residents was a Supreme Dalek without its eyestalk and the same battle damages. (TV: Asylum of the Daleks)