Changes

{{cite}}

|Name = Battle of Isstvan III

|Image = Galaxy in flames clean.jpg

[[Imperium|Loyalist]]

[[Space Marine Legion]]s

|Commanders1 = [[File:SoHSymbol.jpg|20px]][[Warmaster]] [[Horus|Horus Lupercal]]<br>[[File:SoHSymbol.jpg|20px]][[First Captain]] [[Ezekyle Abaddon]]<br>[[File:SoHSymbol.jpg|20px]][[Space Marine Captain|Captain]] [[Horus Aximand]]<br>[[File:Worldeaterslogo.gif|20px]][[Primarch]] [[Angron]]<br>[[File:Worldeaterslogo.gif|20px]][[Space Marine Captain|Captain]] [[Kharn]]<br>[[File:Deathguardlogo.gif|20px]][[Primarch]] [[Mortarion]]<br>[[File:Deathguardlogo.gif|20px]][[First Captain]] [[Calas Typhon]]<br>[[File:Empschildrenlogo.gif|20px]][[Lord Commander]] [[Eidolon]]<br>[[File:Empschildrenlogo.gif|20px]][[Chaplain]] [[Charmosion]](d)<br>[[File:Deathguardlogo.gif|20px]][[Master of Ordnance]] [[Durak Rask]](d)<br>[[Princeps]] [[Esau Turnet]]

|Commanders2 =[[File:Luna_Wolves_Legionssymbol.jpg|20px]][[Space Marine Captain|Captain]] [[Garviel Loken]]<br>[[File:Luna_Wolves_Legionssymbol.jpg|20px]][[Space Marine Captain|Captain]] [[Tarik Torgaddon]] (d)<br>[[File:III Legion Pad.jpg|20px]][[Space Marine Captain|Captain]] [[Saul Tarvitz]] (d)<br>[[File:WEPad.jpeg|20px]][[Space Marine Captain|Captain]] [[Ehrlen]] (d)<br>[[File:DeathGuardSym.jpg|20px]][[Space Marine Captain|Captain]] [[Ullis Temeter]] (d)<br>[[File:III Legion Pad.jpg|20px]][[Space Marine Captain|Captain]] [[Lucius (Emperor's Children)|Lucius]] (defected)<br>[[File:WEPad.jpeg|20px]][[Shabran Darr]](d)<br>[[File:DeathGuardSym.jpg|20px]][[Lieutenant]] [[Crysos Morturg]]<br>[[Magos]] [[Calleb Decima]](d)

|Strength1 = [[File:Blackleglogo.gif|20px]][[Sons of Horus]]<br>[[File:Worldeaterslogo.gif|20px]][[World Eaters]] traitors<br>[[File:Deathguardlogo.gif|20px]][[Death Guard]] traitors<br>[[File:Empschildrenlogo.gif|20px]][[Emperor's Children]] traitors<br>[[Legio Mortis|Legio ''Mortis'']]<br>[[Legio Audax|Legio ''Audax'']]<br>[[Legio Vulpa|Legio ''Vulpa'']]

|Strength2 =~100,000

[[Adeptus Astartes]] loyalists from the:{{Fn|1b}}<br>[[File:Luna_Wolves_Legionssymbol.jpg|20px]][[Luna Wolves]]<br>[[File:WEPad.jpeg|20px]][[World Eaters]]<br>[[File:DeathGuardSym.jpg|20px]][[Death Guard]]<br>[[File:III Legion Pad.jpg|20px]][[Emperor's Children]]<br>[[Ordo Reductor]]

|Casualties1 = High

}}

The '''Battle of Isstvan III''' 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]].{{cite this}}