View source for Defence of the Three Planets

The '''{{PAGENAME}}''' was a battle during the [[Horus Heresy]].{{Fn|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 House]]s. 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.{{Fn|1}}