Annexing Kirkwall is a war table mission in Dragon Age: Inquisition obtainable only if Sebastian Vael was recruited in Dragon Age II and Anders was spared.
Sebastian Vael reclaims his title as Prince and later leads an invasion of Kirkwall. Sebastian requests support from the Inquisition in helping him suppress the city's resistance forces led by Guard-Captain Aveline Vallen and hunt down Anders' associates. The Inquisitor can choose to send Leliana's agents to bolster Sebastian's forces and strong-arm Aveline to back down or send Cullen's military to bolster Aveline's resistance forces and repel Sebastian's occupation forces back to Starkhaven.