Collects Avengers (1963) #270-277.
*Home are the heroes, but the villains are waiting for them! Avengers Mansion becomes the site of one of the team's greatest battles when Baron Zemo's Masters of Evil take down Earth's Mightiest Heroes one by one, one seemingly forever! Plus: an odyssey of Avengers, Alpha Flight and Atlantean civil war! Guest-starring Ant-Man, Doctor Druid and Paladin, later of Thunderbolts fame! *Source: marvel.com