The First Segment was the era marking the beginning of the Last Great Time War. The War Council placed munition factories all over Gallifrey in this period. The War Doctor, who first regenerated in the Fifth Segment, travelled back in time to this period to save Gallifreyan children from a Dalek attack in the munition factory underneath the Mountain of Serenity. (PROSE: The Stranger [+]Loading...["The Stranger (short story)"])
The War Doctor once travelled back into the First Segment to protect children from Daleks. (PROSE: The Stranger [+]Loading...["The Stranger (short story)"])
The War Master was involved in the First Segment of the Time War. (AUDIO: The Devil You Know [+]Loading...["The Devil You Know (audio story)"]) [source needed]