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Gallifrey wasn't destroyed at all. In "The Day of the Doctor" we learned that the War Doctor intended to use the Moment to "destroy Daleks and Time Lords alike" (as the Partisan put it, in "The End of Time") in order to end the Time War but the Moment was so sophisticated & powerful a wapon that it had developed a conscience & it helped the Doctor to find another way of ending the war. In the event, the Moment brought the Tenth & Eleventh Doctors, with Clara Oswald, to Gallifrey on the last day of the war & they devised a method of removing Gallifrey into a pocket universe of its own, leaving the Dalek fleet to destroy itself with its own crossfire. All of the Doctor's first thirteen incarnations helped to do this but, because of the way the Doctor's timestream had crossed itself, only the Eleventh Doctor (& later incarnations) could remember what had really happened.