Defend the Wonder is a game mode of Age of Empires II. It is a varitation of the popular Post Imperial Death Match.
In Defend the Wonder, Player 1 has a Wonder that he must defend for 200 years(300 if a Hun player is in the game, and has researched Atheism). Other players may side with Player 1, but otherwise, the other seven are on a team that tries to knock it down. If the Wonder falls, the attacker wins, if it stands, the defender(s) win.