Defence of the Three Planets

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The Defence of the Three Planets was a battle during the Horus Heresy.[1]

Waged during the Shadow Crusade, the war saw loyalists in far eastern sectors of Ultramar try to rid the Three Planets of traitor forces. House Vornherr and House Vyronii fought on the canal basins of Martrek V, and when the traitors threatened to drive the loyalist Knights back to their landing zones, they received aid from Blackshield Knight Houses. However after the Blackshields had dealt with the traitors, they turned their guns on the loyalists and declared the Three Planets for the Crownless King. A long and bitter war began between the Knight Households.[1]

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Battles of the Horus Heresy
005-006.M31 Battle of Isstvan III • First Battle of Prospero • War Within the Webway • Battle of the Somnus Citadel • Unrest on Caliban • Schism of Mars • Battle of Diamat • Drop Site Massacre • Purging of Taral III • First Battle of Paramar • Manachean War • Signus Campaign • Treachery at Advex-Mors • Siege of Cthonia • Battle for Felweather Keep‎
007-008.M31 Battle of Phall • Broken Key • Devouring of Antarras • Battle of Ravendelve • Ruin of Maerdan • Battle of the Alaxxes Nebula • Pale Stars Campaign • Breaking of the Perfect Fortress • Silencing of Galanta • Chondax Campaign • Second Battle of Prospero • Kolarne-Distal Incident • First Siege of Hydra Cordatus • Battle of the Furious Abyss • Battle of Calth • Shadow Crusade • Battle of Armatura • Betrayal at Ithraca • Death of Canopus • Crusade of Iron • Doom of Bormina • Defence of Tyros • Defence of the Three Planets • Battle of Ulixis • Ambush at Espandor • Battle of Aquila Atoll • Battle of Drooth II • Percepton Campaign • Battle of Iydris • Thramas Crusade • Fall of Baztel III • Battle of Vannaheim • Second Battle of Paramar • Battle of Constanix II • Harrowing of Lastrati • Mezoan Campaign • Battle of Bodt • Battle of Dwell • Erellian Subjugation • Siege of Baal
009-010.M31 Battle of Molech • Breaking of Anvillus • Xana Incursion • Carnage of Morox • Sangraal Campaign • Battle of Arissak • Battle of Perditus • Battle of Sotha • Drussen Atrocity • Scouring of Gilden's Star • Battle of Nyrcon • Battle of Tallarn • Cataclysm of Iron • Battle of Nocturne • War of Drakes • Battle of Pluto • Siege of Inwit • Burning of Ohmn-Mat • Bitter War
011-012.M31 Sacking of Sarcosa-Omikron • Reaving of the Xibana Reaches • Lorin Alpha Campaign • Subjugation of Tyrinth • Malagant Conflict • Battle of the Kalium Gate • Battle of Catallus • Axandrian Incident • Battle of the Haddon System • Jarrazr Incursion • Battle of Tralsak • Tarren Suppression • Siege of Stromhelm • Balthor Sigma Intervention • Battle of Absolom • Scouring of the Ollanz Cluster • War for Xythera • Battle of Zepath • Second Battle of Zaramund • Battle of Anuari • Battle of Pyrrhan • Second Battle of Davin • Argolian Massacres • Battle of Trisolian • Battle of Yarant • Battle of Krade • Battle of Deluge • Battle of Heta-Gladius • Battle of the Aragna Chain • Battle of Kalleth • Battle of the Diavanos System • Battle of Desperation
013-014.M31 Battle of Beta-Garmon • War for Agarops • Defence of Ryza • Battle of Thagria • Passage of Angels • Thassos Incident • Battle of Zhao-Arkhad • Serpent's Coil • Blight of Horstax • Siege of Barbarus • Foricaan Campaign • Battle of Vezdell • Burning of Vrexor • Dawn of Desolation • Death of Chemos • Battle of Luth Tyre • Ydursk Incident • Fall of Tenzebar • Battle of Cambrae • Solar War • Raid on Luna • Siege of Terra • Great Scouring
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