Xenowars

The Xenoswars was a series of battles fought by an Imperial Crusade, between M33-M34, as they attempted to destroy the Biel-Tan Craftworld.^[1]

This was after the Imperium suffered a series of raids at the Eldar's hands, and they battled the elusive Craftworld's forces across a dozen systems of the Segmentum Tempestus. The Crusade, however, was dragged into conflicts with several other Xenos species by Biel-Tan in the process. After later becoming embroiled in a three-year war with a nascent Ork empire, the Imperial forces finally abandoned the hunt for the Craftworld and the Crusade was disbanded. The Tome Keepers who served in the Crusade, however, made detailed notes on the foes they faced and vowed their Chapter would never be tricked by the Eldar again.^[1]

Sources

• 1: White Dwarf 458, pg. 56 — Index Astartes: Tome Keepers