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Only five Space Marines, bearing the gene-seed of their departed brethern, eventually managed to escape and carry news of the disaster to the Emperor. Horus now controlled nine Space Marine Legions and had destroyed three loyal Legions. Throughout the [[Imperium]] loyalists and rebels were fighting each other to a virtual standstill, although the tide of battle was turning, ever so slowly in the Emperor's favour. Horus knew that if he could crush the heart of the Emperor's resistance he could remould the Imperium in his own.
According to background of the first edition Horus was followed by five legions at the time of the Istvaan III destruction (those were the [[Sons of Horus]], [[World Eaters]], [[Emperor's Children]], [[Death Guard]] and [[Thousand Sons]]); from the seven legions sent against Horus we know the four traitors were [[Word Bearers]], [[Night Lords]], [[Iron Warriors]] and the[[Alpha Legion]].
Concerning the three loyalist legions, we have heard of two different theories.