The Avengers #273 (1964)

25th Anniversary cover - Avengers: Under Siege: Part 3 of 8 - "Rites of Conquest!" Script by Roger Stern. Art by John Buscema (breakdowns) and Tom Palmer (finishes). Cover by Tom Palmer. The forces of evil are gathering! Baron Zemo II has assembled a team of powerful super-villains to accomplish something his late father never could: Destroy the Avengers! With Earth's Mightiest Heroes out on the town, Zemo's Masters of Evil attack Avengers Mansion! Goliath, Blackout, Moonstone, Yellowjacket, Mister Hyde, Tiger Shark, Bulldozer, Piledriver, Thunderball, and the Wrecker run roughshod over the Fifth Avenue Mansion! Perhaps it's a good thing that the Avengers weren't home during the attack. But it's definitely a bad thing that Jarvis was. The situation looks grave indeed. Cameo appearance by Paladin. (Note: Baron Zemo sends Whirlwind and the Trapster to ambush the star-spangled avenger in Captain America 324.)