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Mass Effect 2 Codex Database: Entry Details
Battle of the Citadel
Category: Citadel and Galactic Government
Type: Secondary
Installation: Base Installation
In 2183, a rogue Spectre named Saren Arterius attacked the Citadel through a functioning mass relay hidden inside a statue in the Presidium. Saren brought a combined force of krogan and geth infantry from Ilos, timing the attack so that he would be at the Citadel's controls when the geth fleet and his flagship, Sovereign, arrived. In the battle that followed, the Destiny Ascension dreadnought evacuated the Citadel Council, but ordered the wards' arms closed, sealing them and the geth inside an impregnable shell, cutting off any reinforcements or escape. This combative tactic would have wholly destroyed the Council fleet were it not for the actions of Commander Shepard, who had followed Saren through the relay from Ilos.

Led by Shepard's ship Normandy, the Systems Alliance's Fifth Fleet assembled under the command of Admiral Hackett and waited just outside the Citadel's closed arms. Meanwhile, Shepard fought Saren's forces inside the Citadel and eventually forced the ward arms open again. Shepard called for the Normandy to concentrate firepower on Sovereign. The Fifth Fleet took its cue from the Normandy and turned all firepower on the geth flagship, letting the Destiny Ascension and other fleeing Council ships perish fighting the geth fleet. At about the same time Shepard killed Saren, Sovereign's once-impervious kinetic barrier overloaded and the Fifth Fleet focused its military might to shatter the flagship. The geth fleet was soon decimated without its leader.

With the Citadel Council and nearly everyone in its line of succession killed, humanity stepped into the power vacuum. Ambassador Donnel Udina and Captain David Anderson were instrumental in pulling together a new galactic government, with humans as the dominant voice.
Obtained:
• Lazarus Research Station - Received when Miranda quizzes you enroute to the Illusive Man