Desertion

Desertion was the abandonment of one's post. Constance Clarke told the Sixth Doctor that she had no intention of deserting World War II and would return after her travels. (AUDIO: Criss-Cross)

The Were Lords, a species of soldiers created by the Time Lords of Gallifrey to fight in Vampire Wars, deserted from the war and settled in Greece on Earth in 1500 BC. (AUDIO: Brightly Shone The Moon That Night)