The Avengers #117

In "Holocaust," the Avengers and Defenders clash in a brutal interlude of the larger war, with the Swordsman dueling Valkyrie in a crumbling Nazi stronghold and Captain America locked in combat with the Sub-Mariner. As the fighting escalates, both heroes begin to suspect they're being manipulated—caught in a scheme far bigger than either team could have imagined. Written by Steve Englehart and illustrated by Bob Brown, with inks by Mike Esposito and colors by Petra Goldberg, the issue's cover by John Romita and Mike Esposito captures the chaos in stark, dramatic detail.