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The '''Scouring of Gnosis''' was an [[Eldar]] invasion of the [[Imperial]] World of [[Gnosis Prime]].

In 786.[[M41]], Gnosis Prime was subjected to an invasion by the [[Saim-Hann]] [[Craftworld Eldar]]. Despite the fact that the Imperial population of Gnosis Prime had settled some 1,200 years previous, the Eldar [[Autarch]] [[Eliac Zephyrblade]] gave but a single day for the Imperial inhabitants to evacuate. The [[Planetary Governor]], [[Ulyx]], did not take the ultimatum seriously and was confident not only in the strong defensive network of his world (known as the Ulyxis Line) but also the small size of the Eldar fleet orbiting above.{{Fn|1a}}

With the industrial lifeblood of the world now cut off, the world of Gnosis Prime was doomed to a slow and painful death at the hands of not only the Craftworld Eldar but also arriving waves of [[Dark Eldar]] pirates.{{Fn|1}}

The [[Space Wolves]] under [[Logan Grimnar]] arrived after the planet had been all but destroyed. Their trip in the [[Warp]] had gone longer than expected, and more than a year had past in the [[Materium]]. Deciding that if he could not save the people of Gnosis Prime then he would at least avenge them, the Wolf Lord ordered the attack. As Logan Grimnar’s fleet sailed toward the system’s core worlds, he detected the first faint vox cries for help from [[Gnosis Secundus]]. Having crippled and starved Gnosis Prime, the Saim-Hann host had moved on to Gnosis Secundus and its small garrison. Grimnar realized that there might yet be Imperial citizens to save.{{Fn|2}}

Battling the Eldar across the [[Gnosis System]], Grimnar was able to defeat the Eldar on Gnosis Secundus, forcing Zephyrblade to retreat. The Autarch felt great frustration for having underestimated [[human]] foes.{{Fn|2}}

[[Image:SWGnosis.jpg|thumb|center|220px|[[Logan Grimnar]] battles the Eldar]]

**{{Endn|1a}}: pgs. 60-61

**{{Endn|1b}}: pg. 78