This majority of the text of this article comes from its sister at the TARDIS Index file
This article is about the concept of a time war in general. For the Time War involving the Daleks that resulted in the Doctor becoming "the last of the Time Lords", see Last Great Time War.

A time war can be one of at least two types of time-spanning conflicts. The first type of time war is where sides fight each other across different points in history. The second type of time war is one in which Time itself is used as a weapon by two or more time-active factions, employing with pre-emptive strikes, time loops, temporal paradoxes and the reversal of historical events. It is difficult to study these wars, since they tend to erase the damage before it was made.

The first time war fought by Gallifrey was the Black Sun War, starting when the Order of the Black Sun sent a time-travelling assassin to prevent Gallifrey gaining time travel. The Order itself existed 30,000 years in the future, and launched a second attack twenty years later; the Order viewed the Time Lords as striking first in the present, thanks to a Sontaran scheme.

A second war, lasting thirty thousand years, took place a generation after the time of Rassilon. It was fought between the Time Lords and other races that were developing time travel. The Time Lords destroyed one such race, the Charon, before they even existed.

Other time wars include the skirmish between the Halldons and the Eternals. Another was the brutal slaughter of the Omnicraven Uprising. Neither of these wars directly involved the Time Lords, though on both occasions the Time Lords intervened.

At one point in the Doctor's future a war was fought between the Time Lords and the Enemy (who had no other known name). Although Gallifrey was also destroyed as a result of the Eighth Doctor attempting to prevent the war from beginning, this was a different event than the Last Great Time War with the Daleks, which also destroyed Gallifrey.

At some point, Gallifrey was possibly restored, only to be destroyed again in the Last Great Time War.