Avengers (1963) #43-44, and Annual #1 l 21

Hawkeye and Hercules try to rescue Black Widow from Red Guardian and his handlers, but they end up needing to be rescued by the rest of the team instead. The Avengers do, however, save us all from the stupidity of the Psychotron. And then Mandarin tries to take over the world with a fake diamond, some hate rays, and every villain we've ever seen. (He fails).