The Fourth Legion -
"They have had eighteen months to fortify this position," whispered his second-in-command, Berossus, over the vox-channel.
"Iron Without!" roared his Legionaries as they advanced, not running, but walking in a relentless, iron wall. The Imperial Fists fired from the breaches, but the IVth Legion simply ignored the casualties. They were used to taking suicide missions, forced by their primarch, Perturabo, to excel in hopeless situations. The Fourth Legion
The loyalist commander lay broken. Valerius looked down, his helmet displaying endless data streams of heat signatures and structural failures. He didn't feel pride—only the bitter resignation of his Legion's existence. They were the architects of devastation, the ones the Emperor used for the "dirty work", and now, they were the bringers of that same bitter justice to their own brothers. "They have had eighteen months to fortify this
"Record this," Valerius told his sergeant. "Bastion 4-Alpha fell in four days. The Fists are efficient, but the Iron Warriors are inevitable." They were used to taking suicide missions, forced
On the fourth day, the firing ceased. The silence was heavier than the noise. Then, Valerius gave the order. "Iron Within."
When Valerius finally stepped into the command center of the fortress, he did not find a desperate garrison. He found a masterpiece of engineering, now ruined by his own superior engineering.