The War to End All Wars

"The War to End All Wars" (TV: To the Last Man, PROSE: The Way Through the Woods) or "the War to End Wars", (TV: The War Games) was a term to describe a great conflict.

The Daleks were involved in three conflicts known by the term.

World War One
The term was used to describe the First World War of 1914-1918. (TV: The War Games)

The Seventh Doctor recalled that, prior to the First World War, the English applied the sentiment to the English Civil War and the Napoleonic War. (PROSE: Just War)

Though the First World War was fought between factions on Earth, the Daleks became involved on two separate occasions. (AUDIO: The Great War, COMIC: The Dalek Project) In fact, the Eleventh Doctor once guessed the assassination of Archduke Franz Ferdinand was caused by Dalek interference, though he never proved his theory. (COMIC: The Dalek Project)

Pas Jass-Vortan and Last Great Time War
The Daleks applied the sentiment to the Pas Jass-Vortan, their "time campaign" prior to the Shoreditch Incident. (PROSE: Remembrance of the Daleks) By the incident, the Daleks were planning to wage a time war, calling it the Pa-Jass Vortan, against the Time Lords, (PROSE: The Slyther of Shoreditch) leading to the Last Great Time War.

This time war was fought between the Time Lords of Gallifrey and the Dalek Empire. (TV: The Day of the Doctor) The Ninth Doctor (COMIC: Weapons of Past Destruction) and Eleventh Doctor used the term "War to End All Wars" to describe the Time War. (TV: The Day of the Doctor) Similarly, Ohila stated the Time War was the deadliest war that time had ever known or would ever know. (PROSE: The Day of the Doctor)

Other references
During the Sea Base 4 incident of 2084, the Fifth Doctor understood that the Silurians and the Sea Devils intended to start "a war to end all wars" in order to eliminate humanity. (TV: Warriors of the Deep)