A Praetor of the Sons of Horus commands not through inherited rank alone but through a record of victories that a legionary rank and file can see plainly written across his war-scarred plate. Horus favored officers who could improvise under pressure and seize an advantage the instant it appeared, and every Praetor who rose through the Legion's command structure did so by demonstrating exactly that instinct across dozens of campaigns spanning the length of the Great Crusade.
When the rebellion began, these Praetors became the Warmaster's chosen instruments for translating his broader strategic will into the fire and steel of individual battles, trusted to command entire strike forces with only the loosest guidance from Horus himself. A Praetor leading the Legion's assault companies fought with the same expectation Horus set for himself: that a commander's place was at the front of the advance, not behind it, and that hesitation was a luxury the Legion's cause could no longer afford.