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Concurrent:	Quarian-geth conflict Krogan Civil Wars Raid on the MSV Fedele Raid on Storehouse 8B Skyllian Cold War
Next:	Post-war Heretic conflict
Eden Prime War Part of the Reaper campaign, and spillover of the Quarian-geth conflict Unofficially part of the Spectre Wars
Clockwise from top left: members of the Eden Prime Colonial Guard make a desperate last stand against geth forces; a geth colossus stands watch during the Battle of Ilos; the Alliance Fifth Fleet engages geth forces above the Citadel; Saren Arterius oversees geth defenses during the Battle of Virmire.
Date:	9 June - 19 July 2183 CE (1 month and 11 days)
Location:	Council Space / Milky Way Galaxy Attican Traverse / Milky Way Galaxy
Outcome:	Decisive Alliance/Council victory Sovereign is destroyed Saren Arterius is killed CDF suffers heavy losses Citadel is severely damaged Geth heretics largely decimated. Forces in full retreat All indoctrinated forces wiped out Saren's Alliance dissolved Reaper campaign begins Humanity gains a seat on the Council Eventual Reaper invasion delayed for three years Beginning of Post-war heretic conflict
Territorial changes:	Status quo ante bellum Geth heretics lose control of Virmire and the Armstrong cluster
Engagements:	Battle of Eden Prime Skirmish on Gei Hinnom Attack at the Nos Astra Spaceport Jacobus Assassination Attempt Raid on Chora's Den Attack on Hellion Clinic Attack outside Baria Frontiers Raid on Therum Battle of Therum Battle of Feros Armstrong Cluster Campaign Geth Incursions Skirmish on Maji Skirmish on Casbin Raid on Antibaar Battle of Rayingri Raid on Solcrum Battle of Armstrong Peak 15 Containment Breach Skirmish in Synthetic Insights Skirmishes in the Aleutsk valley Battle of Peak 15 Skirmish at Rift Station Battle of Virmire Hijacking of the SSV Normandy Battle of Ilos Battle of the Citadel
Belligerents Systems Alliance Supported by: Citadel Council Saren's Alliance Geth Heretics Indoctrinated forces Indoctrinated asari commandos Droya's tank-bred krogan Supported by: The Reapers Commanders Amul Shastri Joseph H. Garrong Marcus L. Shepard David E. Anderson Steven Hackett Duncan Ward Supporting commanders: Tevos D'gois Creti Sparatus Valern Onoke Venari Pallin † Adrien Victus Irix Coronati Raebant Kirrahe Saren Arterius † Sovereign † Gatatog Verx † Quiath Droya † Benezia M'Soni † Herau I'Loak † Strength Systems Alliance Navy Fifth Fleet 385 ships Eighth Fleet 158 ships Systems Alliance Marine Corps 8,000 marines 160 tanks 42 aircraft Normandy Squad Systems Alliance Colonial Army Eden Prime Colonial Guard Feros Colonial Guard Systems Intelligence Administration Citadel Defense Fleet 132 ships Navy of the Salarian Union Eighth Fleet 1 Galisus-class troop transport Special Tasks Group 3rd Infiltration Regiment Geth Heretic Army 60,000 troops 6,000 aircraft 300 tanks Geth Heretic Navy Fleet of the Herald 320 ships 1 Sovereign-class Reaper Sovereign Heretic Reserve Fleet 113 ships Indoctrinated forces 23rd Commando Company 700 tank-bred krogan Casualties 320 civilian casualties 4,000 military casualties 118 ships destroyed 34 tanks lost 19 aircraft shot down 2,700 civilian casualties 6,000 military casualties ~45,000 geth destroyed 4,470 aircraft shot down All tanks destroyed Fleet of the Herald wiped out Heretic Reserve Fleet halved 23rd Commando Company wiped out All tank-bred krogan wiped out

"Its time for us to step up and do our duty. No more sidelining. We are the frontlines, people. We stop Saren; if that means fighting through an army of geth, so be it. This could very well be a fight for the galaxy. Do your part. Don't tread lightly. Fight. Fight for your people but most of all, fight to stop Saren."

— Marcus Shepard

The Eden Prime War, also known as Saren's War to the Council, the Human-Geth War to the Alliance and unofficially in some Council circles as the Fifth Spectre War, was a relatively small-scale conflict between the Systems Alliance and the geth heretics led by rogue spectre Saren Arterius, with limited Council involvement. Beginning on June 9, 2183 CE with the Battle of Eden Prime, the war lasted until July 19, culminating in the Battle of the Citadel. The war was one of three conflicts that have become known as the Reaper Campaign.

Some Council historians list the conflict as the fifth and last Spectre War, largely due to the fact it involves a spectre hunting down another, but most historians and scholars have disregarded this as inaccurate, and officially list it as separate from the Spectre conflicts, with the Fourth Spectre War remaining as the last of the conflicts.