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From Warhammer 40k - Lexicanum
grammar correction
Half of these legions turned against the Imperium in a rebellion known the Horus Heresy. Under the Emperor's greatest general, the Primarch Horus, these Traitor Legions fought the loyal Legions in a galactic civil war, culminating in a siege of Terra. The Heresy ended only when Horus was slain by the Emperor.
After the Heresy, the vast Legions were divided into the separate Chapters the Astartes now consist of, each numbering roughly a thousand fighting brotherseach.
To this day the loyal Space Marines continue to protect Humanity from aggressive alien species, like the barbaric [[Ork]]s, the [[Eldar]], their renegade kin the piratical [[Dark Eldar]], the technological and idealistic [[Tau]], the voracious [[Tyranids]] and the ancient [[Necrons]], besides many other alien races. Alongside these threats to mankind's continued dominance are the [[Chaos Space Marines]], who survive and remain a threat to this day.
