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The Maginot Line[1], otherwise known as the Maginot Sphere, was a Forerunner defensive line that protected the Forerunner inner colonies. It divided what the Forerunners were able to protect from what they had to leave to the Flood. Its precise location is unknown, but from records drawn from the Halo 3 Terminals, we can assume that Earth was not inside it and neither were most of the worlds the Librarian visited in her duties.

It was heavily damaged when the Flood made a massive attack on it, led and commanded by the rampant Forerunner AI Mendicant Bias. It was the primary line of defense holding the Flood back. It is assumed that it was broken before the first firing of the Halo Array. It was a sphere around a Forerunner-controlled area of space.

It can be assumed that for a long time the Didact worked in the Maginot sphere, frequently sending transmissions from it to the Librarian asking them to retreat behind it to where the Didact said their Fleets could protect the Librarian. Although it was a defense against the Flood, it cannot be assumed that the Flood conquered all worlds that were outside of the Sphere, as Earth which we know was outside of it was presumably not infected because the Librarian was on it, looking at how beautiful it was before the Array fired.

The Maginot Sphere may have been a physical object, (an energy barrier of some sort) as a Keyship was needed to enter it. It may also be a hypothetical line, not a physical object, used to mark what could and couldn't be saved, and the fleets guarding it would not permit you to pass unless you were in a Keyship.


It is important to note that Maginot Line would not have been the actual name used by the Forerunners. The Forerunner records describing the line were discovered using translation software so advanced that it incorporates idioms from the reader's own experience.[2] Thus words such as "Eden", "fairy tale" or "Maginot Line" became the default usage in Forerunner terminals and transmissions when read by Humans.[3] This was likely because there is no direct translation for the original Forerunner words, thus the software utilizes human equivalents. These words appear in brackets in the Terminals.


  • The Maginot Line was a World War II French line of fortifications, meant to repel an anticipated assault from Germany. Though it dissuaded a direct attack, German tank units maneuvered around the fortifications, bypassing most of them altogether, making the fortifications mostly useless and leading to the fall of France. When the Allies retook France, the Germans manned them, but again the majority of the lines were bypassed.[4]


  1. Terminals
  2. Halo Encyclopedia, page 165
  3. Halo Encyclopedia, page 165
  4. Wikipedia's article on Maginot Line
Forerunner-Flood War
Battle of LP 656-38 eBattle of DM-3-1123 bBattle of CE-10-2165-dBattle of G617 g1Battle of the Maginot SphereBattle of the Halo Array
LibrarianDidact032 Mendicant BiasOffensive BiasGravemind
TerminalsKeyshipThe ArkMaginot Sphere
Primary Pioneer GroupAdvance Survey Team-AlphaEmergency Circumstance FleetSuppression FleetSecurity FleetForerunner Fleet Command

This article uses material from the "Maginot Line" article on the Halo wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.


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