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Since its discovery, the [[Boros System]] has been heavily fortified and staunchly defended by the Imperium thanks to the strategic value of the stable wormholes that directly link it into the [[warp]]. For ten thousand years, the forces of [[Chaos]] have attempted to take control of the system, but every invasion had been repulsed until a massive force of [[Word Bearers]] assaulted and [[Battle of the Boros Gate|nearly conquered ]] the system at some point in 999.[[M41]].{{cite this}}