Activision has officially revealed Call of Duty: Modern Warfare 3 inside of Warzone with the new Shadow Siege event, which allows players to continue the post-launch story from Modern Warfare 2's Raid episodes and sets up the narrative for Modern Warfare 3's campaign. Here's what Warzone's live event consists of and what you can expect.

The Shadow Siege event is a limited-time event played on Warzone's Al Mazrah in a quads playlist. Players are given orders by Shadow Company leader Philip Graves to team up for a group effort to assault the Konni-occupied Zaya Observatory in Al Mazrah and secure chemical weapons.

The event is played out in stages, requiring squads to drop in and first disable all eight missile silos marked on the map. Once the silos are secured, the Zaya Observatory is bombarded with missiles, changing the landscape of Al Mazrah.