Siege of Mafeking

The  was the subject of The Definitive Account of Mafeking by Atcheson-Price, a book that John Smith lent to Tim Latimer. While waiting for Smith to retrieve the book, Latimer stole Smith's fob watch, which, unbeknownst to him, contained the Tenth Doctor's Time Lord essence. (DW: Human Nature)
 * ''Though unrevealed in the episode, the was a real event in the Boer War.