The Geometry of Isstvan V

The Iron Hands, the Salamanders, the Raven Guard. The Gorgon leads because he always leads. Vulkan leads because he does not abandon his brothers. Corax conducts a reconnaissance that there is nowhere here to conduct. The geometry is simple and deadly: the loyalists dig in within the Urgall Depression, the ring of traitors closes, the second wave comes out on the ridge from the northern edge. The atlas does not draw trenches — it draws the fact that three Legions stand at a single point to which “their own” are about to come.

The Iron Warriors, Night Lords, Word Bearers and Alpha Legion land as reinforcements. Perturabo knows how to close a ring. Curze knows how to finish a kill. Lorgar has long awaited this day. Alpharius knows how to make sure the news does not get out. Together with the already open XVI, III, XII and XIV that is eight Legions against three in a cauldron where even the orbit belongs to the enemy. Why the second wave was believed: because the alternative is to admit that half the primarchs are in the plot, and there is no language for that. The language will come afterwards, in the Codex and in trauma.

Fulgrim and Ferrus are brother-smiths. The Laer blade is already guiding the hand of the Phoenician. The beheading of the Gorgon at Isstvan V makes the war irreversible for the III and the X: after this there is no “we will talk”. Ferrus Manus is the first primarch to die in the Heresy, and his death stands in one frame with two hundred thousand slain Astartes. The duels are set apart in the atlas precisely because the operational map swallows them as an outcome of “Atrocity”.

The X: splinters and the vengeance of Shadrak Meduson. The XVIII: Vulkan is missing (Curze captured him), the Legion is scattered. The XIX: Corax gathers a handful, goes off into guerrilla war, and then returns to Deliverance, where the attempt to restore the Legion through the Emperor’s genetic gifts will end in catastrophe. The loyalist column loses weight as it did in no field battle. Beta-Garmon and the Siege will be paid for by this frame: there is no one left to cover the approaches.

The Signus Campaign is not “one more battle” but the subtraction of Sanguinius from the response to the drop site. Horus knows whom he must not let near Isstvan, and sends the Blood Angels to the cluster, where a daemonic master awaits them. The atlas sets Signus almost back to back with the drop site — both in 006.M31 — so that the eye has no time to “catch its breath”.