The Nova Class "Atlantia" was selected by Admiral Nagala as his flagship during the Fall of the Twelve Colonies following the destruction of Picon Fleet Headquarters. Atlantia was eventually destroyed along with the bulk of the remaining fleet over Virgon, while attempting to buy time for civilians to escape the planet.

As a result of the Atlantia's destruction, Commander William Adama assumes command of the Colonial Fleet and proceeds to Ragnar Anchorage while General John Connors is ordered to save as many lives as possible and then rendezvous with the Galactica to give Adama command of the remains of the Colonial Fleet. However, Connors is unable to contact Adama before the Galactica escaped the Twelve Colonies of Kobol