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From Warhammer 40k - Lexicanum
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{{QuoteBox |quote = '''''"Order the guns to fire! Let the galaxy burn!"''''' |source = [[Warmaster]] [[Horus Lupercal]]{{Fn|2a}} |width = 30em}}
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{{QuoteBox
|quote = '''''"Order the guns to fire! Let the galaxy burn!"'''''
|source = [[Warmaster]] [[Horus Lupercal]]{{Fn|2a}}
|width = 30em
}}
{{Battle3
|Name = Battle of Isstvan III
|Casualties3 = 8 billion Isstvanians{{Fn|1}}
}}
The '''Battle of Isstvan III''' (also referred to as the '''Isstvan III Atrocity'''{{Fn|1c}}{{Fn|1d}}) was the start of the [[Horus Heresy]] and was fought between the [[Adeptus Astartes]] loyal to the [[Emperor of Mankind]] and those traitors that swore fealty to [[Imperial Guard Hierarchy#Warmaster|Warmaster]] [[Horus]].{{Fn|1a}}
