Who: Romana and Narvin.
What: So that thing Narvin did at the end of S6? Yeah. That. There are consequences.
Where: Romana's chambers in the Capitol.
When: Some time after the end of S6, in the early days of the Time War.

In the wake of the Matrix affair and the Dalek invasion attempt, Romana had expected that noxious species to retreat to its bolt-holes and stay out of Gallifrey's way. And they did, for a time. For a while, there was nothing from them. A little later, certain far-flung Gallifreyan research outposts reported signs of Dalek scout ships, but there were no overt attacks. They merely seemed to be ... watching.

Things came to a head quite abruptly. In the span of a week, the Monan Host, the Unvoss, and the Virgoans cut off diplomatic ties with Gallifrey. The others became strangely distant. Romana and the High Council were driving themselves half-mad trying to determine the source of the sudden political chill and repairing the damage when she received a confidential transmission from a Nekkistani ambassador—who, he made very clear, was acting outside the remit of his government.

"The Daleks said what?"

"Just so, Madam President. That Gallifrey has acted with unprecedented aggression, contravening its own temporal laws and the treaties signed by the Temporal Powers, attempting to snuff them out at their source."

"But that's—I never signed off on anything of the kind!"

"I am sure you didn't, Madam President. I, at least, have that much faith in you. Hence my desire to warn y—"

The transmission was abruptly cut off in a shriek of static, and minutes later, a terrified-looking CIA officer came running into Narvin's office with the first words of a Dalek attack on a Gallifreyan research outpost that was not-so-secretly run by the CIA—burned to the ground, all hands dead. At the same time, an administrator came running to tell Romana that Dalek fleets were massing in the quadrant around Skaro.

So it began.