1900

January

 * Joan Redfern's husband Oliver was shot and killed at the Battle of Spion Kop. (DW: Human Nature) The same was true of Private Tommy Watkins. (CC: Tales from the Vault)

May

 * 17 - The Doctor was present at the Relief of Mafeking. (DW: The Daleks' Master Plan)

Unknown Dates

 * The War Lords kidnapped troops from the Boxer Rebellion in China for use in their War Games. (DW: The War Games)

February

 * 21 - Sydney Arnold, who played Perkins in DW: The Highlanders, was born in London.

May

 * 15 - American author L. Frank Baum's book, The Wonderful Wizard of Oz, was first published. Elements from the story and the 1939 musical film adaptation were incorporated into several Doctor Who stories.