What Was the Drop Site Massacre?
DIRECT ANSWER
The Drop Site Massacre was a major betrayal during the early stages of the Horus Heresy. Loyalist Space Marine Legions landed on the planet Isstvan V expecting reinforcements. Instead, several legions secretly allied with Horus turned against them, causing devastating losses.
QUICK FACTS
| Item | Detail |
|---|---|
| Event | Major betrayal during Horus Heresy |
| Location | Isstvan V |
| Loyalist Legions | Raven Guard, Salamanders, Iron Hands |
| Traitor Legions | Several Horus-aligned legions |
| Outcome | Loyalist forces nearly destroyed |
EXPLANATION
The Drop Site Massacre occurred when loyalist forces attempted to defeat Horus’s supporters on Isstvan V. Reinforcements arrived as planned, but many of these legions had already joined Horus’s rebellion. When the loyalist troops were fully committed to battle, the traitor legions attacked them from behind. This surprise attack devastated the loyalist forces and eliminated many experienced warriors and leaders.
WHY IT MATTERS
The Drop Site Massacre significantly weakened the loyalist forces early in the Horus Heresy. The loss of multiple legions reduced the Imperium’s military strength and allowed Horus to expand his rebellion across the galaxy.
RELATED LORE
What Is the Horus Heresy
What Was the Siege of Terra
Who Are the Primarchs
What Is the Imperium of Man
FAQ
Where did the Drop Site Massacre occur?
The battle took place on the planet Isstvan V.
Why was it called a massacre?
Loyalist forces were betrayed by allied legions and suffered devastating losses.
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