Arcadia (city)

Arcadia was, according to the Eleventh Doctor, "Gallifrey's second city". (TV: The Day of the Doctor) During the Last Great Time War, it was thought to be "the safest place on Gallifrey", protected by 400 sky trenches. Nevertheless, Dalek forces managed to breach these supposedly impregnable defences on the last day of the War. This led to the fall of the city, which was depicted in a painting. The War Doctor was present. (TV: The Last Day, The Day of the Doctor)

During the Fall of Arcadia, the War Doctor borrowed the gun of a Time Lord soldier to blast the message to both Daleks and Time Lords on a wall — "No more". Once the message was completed, he flew his TARDIS through a wall and into a group of Daleks before fleeing the city. (TV: The Day of the Doctor) Bowships were used in the battle, but failed to prevent the city's fall. (PROSE: A Prologue)

The Moment showed the War Doctor, Tenth Doctor, Eleventh Doctor, and Clara Oswald the ruined state Arcadia had been left in by the Time War. Among these images were innocent civilians screaming and crying in terror as Arcadia was torn apart by Dalek invasion. This was a deliberate choice so the Doctors and Clara would understand the ultimate consequences of destroying Gallifrey. This helped convince them to find a more peaceful solution to end the war. (TV: The Day of the Doctor)

The Tenth Doctor later mentioned that he was present at the Fall of Arcadia, and that he still hadn't gotten over it. He hoped one day to come to terms with it. (TV: Doomsday)