Avengers (1963 1st Series) #145
"The Taking of the Avengers!" Part 1 of 2. Script by Tony Isabella and Scott Edelman. Pencils by Don Heck. Inks by John Tartaglione. Cover by Gil Kane and Dan Adkins.
The Avengers series takes a two-issue hiatus from the Squadron Supreme saga. A mysterious elderly man hires the Assassin to kill Earth's Mightiest Heroes! How is a lone gunman going to take down the Avengers? He starts with an ambush of Captain America!