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{{Otherusesotheruses|USE=Loyalist guerrilla actions|OTHERUSE=[[World Eaters]]/[[Word Bearers]] actions post-[[Battle of Calth]]|OTHERPAGE=Shadow Crusade}}{{otheruses|USE=Heresy-era battlebattles|OTHERUSE=Inquisition campaign|OTHERPAGE=Shadow War}} 

As the main battles of the Heresy waged, the Shadow Wars were fought largely unseen. The Shadow Wars were not fought by conventional [[Space Marine Legion]] fighting units. Rather, they were fought entirely apart from any structured authority or grand strategy. Most of the loyalist forces in the Shadow Wars were ad hoc and secretive forces, such as surviving bands of Astartes from the [[Shattered Legions]], the [[Knights-Errant]], and the [[Blackshields|Blackshield]]swarbands. Over the course of the Heresy, these small irregular units undertook thousands of separate engagements against the traitors loyal to [[Warmaster]] [[Horus]].{{Fn|1}}

*{{Endn|1}}: [[The Horus Heresy Book Six- Retribution]] , pgs. 13–21