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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]