Attack on Craftworld Feinnwe

The Attack on Craftworld Feinnwe was a xenocidal castigation campaign conducted by the fierce and unforgiving Iron Spears Space Marine Chapter against the Aeldari of Craftworld Feinnwe, located in the Celtic Sector in the Segmentum Ultima.

Background
In 057.M38, the Aeldari Craftworld Feinnwe (a Craftworld that usually roams the Celtic Sector) strayed to close to an Imperial planet and was attacked by the planet's PDF Forces. The Aeldari of Craftworld Feinnwe were able to completely eliminate the PDF and exterminate the Imperial Colonists on the world below.

Despite the Aeldari victory, the Craftworld's destruction of an Imperial planet caught the attention of the Celtic Sector's local Space Marine Chapter, the Iron Spears. High Chieftain Chulainn Nuada, Chapter Master of the Iron Spears, led several Companies worth of Marines in a massive and devastating assault on the Craftworld Feinnwe. The Iron Spears managed to slay almost a third of the Craftworld's population before withdrawing, believing justice for the lost Imperial world had been sufficiently exacted. The Attack on Craftworld Feinnwe is considered to be the first major victory in the history of the Iron Spears Chapter.

Following the Attack on Craftworld Feinnwe, the Iron Spears and Feinnwe Aeldari entered a perpetual 'Cold War'. With the exception of a few skirmishes, firefights, etc. the Feinnwe Aeldari and the Iron Spears never partook in major conflicts against one-another again.