Changes

Despite its low population, Bianzeer's Hollow became one of the most strategically vital battlezones as it was home to Inquisitor [[Nashir Sahansun]] base of operations as well as shielding the [[Octos System]]. The Imperials were resolved to stand their ground and extensively prepared for the coming attack. On [[Saint's Blessing]] the miners mapped their tunnels extensively and baited areas with soiled clothing and parts of the dead. When [[Ravener]]s and [[Termagant]]s emerged, they triggered booby-traps which collapsed the entire tunnels. In return, the defenders suffered heavily, as the Tyranids soon adapted and tunneled around these traps to ambush Imperial forces. The desperate Imperial subterranean defenders soon earned the name 'Tunnel Devils' for their actions. On [[Holy Toil]], the quarries demolition experts were organized into brigades which laced strategic passes with minefields. Using these tactics they killed many Tyranids in rock-slides and kill-zones. On [[Death of Bianzeer]] thousands of trackers mounted on ice-sleds pulled by [[Canid]]s lured swarms of Tyranids into the frozen Great Lakes of Peldathusa. The Tyranids did not know the safe routes through the thin ice covering, and hundreds of thousands fell into the freezing waters. However , much to their horror the , the Tyranids emerged from the waters unharmed and annihilated all in their path.{{Fn|10b}}

Four Deathwatch [[Watch Company|Watch Companies]] from the Eye of Octos fought in Bianzeer's Hollow, waging a valiant defense defence on Saint's Blessing's factory-spaceport centercentre. Using Malleus tactics, the Deathwatch struck down burrowing xenos and raced in battle tanks to wherever they reared their heads. After slaying the tunneling tunnelling organisms, the Deathwatch rushed along the Tyranid tunnels and collapsed them with explosives. In response, the Tyranids launched hundreds of tunnel raids simultaneously, slaughtering countless [[Guardsmen]] in the facility before eventually being driven away by more troops that had to be pulled off a major sallying effort. The Tyranids bombarded the defenders with barrages of Spore Mines, destroying defensive positions and inflicting horrific casualties. Despite the heavy fire, Deathwatch kill-teams calculated targeted telemetry for Imperial counter-battery fire that silenced the xenos gun-beasts, creating breathing space they needed to throw back the frontal and aerial assaults. The defenders held on and more Tyranids were drawn in, and without the Deathwatch's actions Bianzeer's Hollow would not have stood its ground against the Xenos. However the Imperials paid a heavy price, and while the Tyranid advance was eventually broken it would take years before surviving xenos were purged from the system completely.{{Fn|10b}}