Defense of Mars

This article's title is a callsign, an alias, or a nickname, as no proper name for the subject has been revealed.

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Concurrent:	Battle for Earth
Next:	Battle of Cleveland Scramble onboard Forerunner Dreadnought
Battle of Mare Erythraeum
Conflict:	Human-Covenant War Siege of the Inner Colonies
Date:	c. before November 16, 2552
Location:	Mare Erythraeum, Mars, Sol system
Outcome:	Covenant victory UNSC forces on Mars crushed Colonel Ackerson captured
Details Belligerents United Nations Space Command Covenant Commanders COL James Ackerson Shipmaster Lepidus (post-Great Schism) Strength UNSC Army forces 1+ Covenant fleet Fleet of Furious Redemption 4+ Ket-pattern battlecruisers Triumphant Declaration Unknown number of ground forces Casualties Unknown - presumably heavy Unknown

The Battle of Mare Erythraeum was an engagement of the Human-Covenant War in late 2552 where UNSC Army forces led by Colonel James Ackerson fought the Covenant on Mare Erythraeum on the surface of Mars. It occurred simultaneously with the Covenant's prolonged invasion of Earth and resulted in a Covenant victory. After the UNSC's eventual defeat on Mars, the Covenant began to concentrate more of their forces on Earth, although Ackerson's work in this battle helped buy UNSC ground forces on Earth precious time. During or after the engagement, Colonel Ackerson was taken prisoner and taken aboard the Ket-pattern battlecruiser Triumphant Declaration.

Although the Martian defense forces were eventually crushed, they are credited for delaying Covenant forces from pressing their siege on Earth.

List of appearances

• Halo: Uprising (First mentioned)
• Halo 5: Guardians
  • Limited Edition dossiers (Mentioned only)
• Halo: Divine Wind (Mentioned only)