The Avengers Vol. 1 (1963-1996) #161

Plot

In incredible fashion the Avengers are attacked at their Fifth Avenue Mansion! And the assailant is none other than the Ant-Man! What in the world has happened to Hank Pym?!? Fortunately with help from the Wasp, the Avengers corral their diminutive teammate! But that only buys Earth's Mightiest Heroes a few more hours until the next attacker arrives...a certain adamantium attacker! It's a super showdown inside Avengers Mansion as eight avengers lay it all on the line against Ultron! (mycomicshop.com)