"Siege" is an American comic book published by Marvel Comics from January 2010 to May 2010. It deals with the culmination of the "Dark Reign" storyline which saw Norman Osborn become the United States primary defense officer, leading H.A.M.M.E.R. and employing his own evil Avengers. The story depicted Loki manipulating Osborn into leading an all-out assault on Asgard, at the time located within the United States. Captain America and his own Avengers lead a rebellion against Osborn which escalated to an all out assault. The events in "Siege" led to Marvel Comics introducing the subsequent storyline, "Heroic Age".