Tranch is a Hive world that played out as the backdrop for one of the most brutal and thankless wars in the sector, the The Tranch Insurrection.
The Tranch Insurrection was a mutant uprising in the soot warrens of the minor industrialised hive world of Tranch and rapidly developed into a planet-wide insurrection which toppled the ruling class, the brutal Oligarchs of Tranch. The mutants formed together into a unified faction calling itself the Pale Throng, led by a cabal of terrifyingly powerful witches and mutant-psykers known as the Shroud Council. As rumours of the successful rebellion spread, so did brushfire revolts and uprisings on other worlds in the sector, and the flames of malcontent were fanned. Lord Sector Hax realized the wider threat to Imperial order and declared a mass counter-invasion of the war-torn world to bring the rebellion to heel, and called upon the Inquisition to dispose of the Shroud council, which they do, whilst Ordo Hereticus launched Operation Bellerophon to decapitate the mutant forces. At huge cost in lives and at the price of laying waste to much of Tranch, the Pale Throng was crushed, but its many factions manage to scatter off-world. Sympathizers still raise revolt in the pale Throngs name elsewhere to this day. Although the war is officially over, the pacification of Tranch goes on, providing a bloody baptism of fire for many of the sector’s soldiers.