The Borg-Species 8472 War was a brief, but highly destructive conflict fought between forces of the Borg Collective and Species 8472. The war was fought over at least five months, ending in early 2374. The war was triggered by Borg incursions into fluidic space – Species 8472's native realm. However, Species 8472's biological integrity proved highly resistant and completely impervious to Borg technology. Species 8472 destroyed the invaders and proceeded to retaliate with an invasion of the Milky Way Galaxy, intending to purge it of what they considered inferior lifeforms.