War

War was a type of conflict.

The Time Lords warred with the Great Vampires during the Dark Times. (TV: State of Decay) They also engaged in two major time wars which appeared to destroy Gallifrey: the War in Heaven against the enemy, (PROSE: Alien Bodies, The Ancestor Cell) and the Last Great Time War against the Daleks. (TV: Dalek, The Day of the Doctor)

Earth had at least six world wars: Two in the 19th century, (TV: Twice Upon a Time, PROSE: Timewyrm: Exodus) two between the 20th and 25th centuries, (AUDIO: Frostfire) one in the 37th century (COMIC: Art Attack) or the 49th century (AUDIO: Singularity) and one in the year 5000 (TV: The Talons of Weng-Chiang; AUDIO: The Butcher of Brisbane) The Ninth Doctor mentioned he was present at World War V. (TV: The Unquiet Dead)

After the First Doctor helped defeat the Daleks during the First Dalek War, his granddaughter Susan stayed on Earth with resistance fighter David Campbell. (TV: The Dalek Invasion of Earth, Prelude Deceit)

The War Lords kidnapped humans from various wars in Earth's history to create an army to conquer the galaxy. (TV: The War Games)

The Rutans and Sontarans were at war with each other for thousands of years. (TV: The Time Warrior, The Sontaran Experiment, TV: Horror of Fang Rock, The Poison Sky)

Article 15 of the Shadow Proclamation said that murder was not a rule of war. (PROSE: Diamond Dogs)