SIEGE was a Marvel crossover event from 2010 that consists of a 4-issue mini-series of the same name and several tie-ins in the form of one-shots, mini-series, and issues from ongoing series. Set between the DARK REIGN storyline and the HEROIC AGE relaunch, SIEGE is the story of Osborn and his evil Avengers' all-out attack on Asgard (which was quixotically located in the US at the time) and its defense by Captain America and his non-evil Avengers.