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(continued) As the Ultramarines were engaged in the southern part of the galaxy, news of the Horus Heresy did not reach Roboute until Earth was already under attack. While unable to assist in the early part of the conflict, the Ultramarines did succeed in preventing a large force of Chaos reinforcements headed for Horus's position. Since it was largely uninvolved in the battle, the Ultramarines were by far the largest force after the Heresy. Sighting the shortcomings of the Legions, Roboute set about developing the Codex Astartes, to prevent any further loss of Marines to the temptations of Chaos. The Ultramarine Legion was split many times over into well over twenty Chapters, whereas most Legions were only split a few times. All of these newly created Chapters still gave their loyalty to Roboute, making him the most powerful of all Primarchs. |