Upon arriving in Area 11, Cornelia launches a military campaign against Zero's Black Knights and the other rebel factions, crushing all but the Black Knights. After Euphemia's death, she learns that Zero is Lelouch. In the aftermath of the Rebellion, Cornelia is labeled MIA by Britannia, as she goes underground to expose the existence of Geass in order to clear Euphemia's name. However, upon infiltrating the Geass Order and learning of her father's ties to it, Cornelia is captured by V.V. until the Black Knights' assault on the Order allow her to break out of her cell. Following V.V.'s death, she is taken prisoner by Lelouch, but manages to escape in the aftermath of the Second Battle of Tokyo, joining Schneizel when he arrives as an envoy and telling him everything she learned relating to the Geass Order.