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From Warhammer 40k - Lexicanum
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|Strength2 =~200,000 [[Ultramarines]])<br>~1 million [[Ultramar Auxilia|Auxilia]] and [[Imperial Army|Army]]<br>[[Skitarii]] Cohorts<br>112 [[Titans]]<br> Bulk of Ultramarines fleet
|Casualties1 = 50,000 Astartes killed<br> All titans destroyed<br>All cultists killed<br>Half of Word Bearer fleet destroyed<br>Flagships [[Infidus Imperator]] & [[Destiny's Hand]] destroyed
|Casualties2 = 119,422 Astartes killed<br>28,392 Astartes crippled<br>100 Titans destroyed<br>4/5th of Ultramar fleet destroyed<br>At least 500,000 Army & Mechanicum casualties
}}
The '''Battle of Calth''' was a major battle of the [[Horus Heresy]], in which the [[Word Bearers]] [[Traitor Legion]] attempted to exterminate the [[Ultramarines]] [[Space Marine Legion|Legion]], on the orders of [[Warmaster]] [[Horus]], who anticipated that [[Guilliman]], the Ultramarines' [[Primarch]], would not join his rebellion against the [[Emperor]].
