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The initial Guard landings were poised to assault [[Nero Hive]]. However, during the operation, a [[Psyker|psychic storm]] erupted over the [[hive]] which destroyed or disabled a number of [[troop-ship]]s and prevented further Guard from reinforcing the first wave. A detachment of the Tanith First and Only led by [[Colonel]] [[Colm Corbec|Corbec]] managed to find the source of the storm while making their way through the western part of Nero - a [[daemon]]. After successfully retreating from the creature, Corbec gave coordinates for the ''[[Navarre (Ship)|Navarre]]'' to initiate an [[orbital bombardment]], levelling the entire block, destroying the daemon and ending the storm.{{Fn|1a}}
Once the Imperials had secured Caligula, they stationed a number of Guard regiments there to hunt down any surviving cells of [[Chaos Cult]]ists and support the rebuilding process. [[General]] [[Thoth (General)|Thoth]] placed [[Colonel-Commissar]] [[Ibram Gaunt]] of the Tanith First in charge of coordinating civilian relief convoys transporting supplies from [[Aurelian Hive]]. At the time, bandit attacks on the convoys were common, but the bandits were too hard to track down and exterminate directly. Once [[Vox-operator|Comms Officer]] [[Raglon]] examined the hive's [[vox]] traffic, however, it became clear that someone on the convoys was in league with the bandits, feeding them the convoys' positions. Gaunt decided to lure the bandits out of hiding by using a convoy from Aurelian to [[Hive Calphernia]] as bait, placing [[Trooper]] [[Bragg]] in charge. Sure enough, [[Tlewn Milloom|one of the drivers]] called in the bandits to raid, thinking Bragg was a simple-minded fool whose forces could be dealth with easily, exposing them to a counterattack by [[Marauder Bomber]]s of the [[Imperial Navy]].{{Fn|1b}}
==Geography==
Caligula's surface was largely barren pumice rock punctuated by a variety of depressions including old craters and extinct calderas, some of which were large enough to support microclimates with thriving ecosystems. Caligula's settlements, including the planet's capital [[hive]] city of [[Nero Hive|Nero]], were also built in these depressions.{{Fn|1a}}
The surface of the planet between these settlements and inhabited areas is known as the "deadlands". Many [[Imperial citizen]]s fleeing the war escaped to the deadlands and became bandits, preying upon supply convoys.{{Fn|1b}}
===Notable Locations===
