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Based on what we've been told on TV, we know from "Dalek" that the Doctor destroyed 10 million Dalek ships, we know from "Doomsday" he fought on the front lines and witnessed the fall of Arcadia and finally, we know from "The End of Time", part two" that he used something called The Moment to destroy the Time Lords and the Daleks and end the war.

the Doctor's reference, in "Dalek", to destroying 10 million Dalek ships sounded like a description of what happened when he used the Moment to end the war. He told the Dalek that the Time Lords "burned with you", meaning all were destroyed at the same time.