Horus Heresy · atlas

Campaign · Signus Cluster · Segmentum Ultima · 006.M31

The Signus Campaign

The Blood Angels are drawn away from Isstvan into a trap of the warp. Ka’Bandha, the Thirst, the near-fall of the IX. Sanguinius defeats the daemon and does not reach the drop site in time — Horus has won even while losing the field.

Outcome A Pyrrhic loyalist victory: the cluster is cleansed/destroyed, the Legion wounded, and they did not come to Isstvan.

Commanders

Loyalists

Commanders

Traitors

Commanders

Theatre
Signus Cluster · Segmentum Ultima
Period
006.M31
Legions
Systems

Analysis

Signus is a model “war without an enemy Legion”. Horus does not set Astartes against Sanguinius: he sets a Bloodthirster against him, and a system already given over to the warp. The aim is twofold: to kill, or to make fallen, the likeliest rival for the Father’s love, and to subtract the IX from Isstvan V. In timing the campaign nearly coincides with the Drop Site — both fall in 006.M31 — and this is no accident of the staff but a parallel operation. The route “Baal → Signus → (later) Macragge” shows that the Angels were not “late”: they were led away. The canon of Fear to Tread / Malevolence: Sanguinius defeats Ka’Bandha at a cost, and the Thirst becomes a Legion-wide event for the first time. The strategic result is paradoxical: a field victory for the loyalists, an operational victory for Horus. That is exactly why Sanguinius ends up on Macragge and becomes the Regent of Secundus.

Order of battle

The IX Legion at almost full muster (the Baal Muster, 005.M31) against the daemonic legions of Khorne and the traps laid by Horus’s agents. By the time of arrival the mortals of Signus are no longer a party. The ship-to-ship fighting is secondary to the planetary warp strike.

Turning points

  1. 005.M31 The Muster on Baal — The Baal Muster · advance on Signus

    Horus gives Sanguinius “a glorious war of his own”. The bait is swallowed.

  2. 006.M31 Ka’Bandha — The Signus Campaign · Signus Prime

    The daemon breaks a Legion and a primarch. The Thirst slips out of control.

  3. 006.M31 Refusing the Fall — The Signus Campaign · Signus Prime

    Sanguinius wins and remains loyal — but Isstvan V is already over without him.

Events of the campaign

  1. 005.M31 The Baal Muster · advance on Signus Inconclusive

    Having received from aboard the Word Bearers’ “Dark Page” Horus’s order to put down a supposed uprising, Sanguinius mustered the main forces of the Blood Angels at his home world of Baal.

  2. 006.M31 The Signus Campaign · Signus Prime Pyrrhic loyalist victory

    Horus lured the Blood Angels into the Signus Cluster in order to destroy them; there a trap of daemonic legions awaited them.

Significance

Subtracts the Blood Angels from the first phase of the war and prepares them for the role of the Regency and, later, the last wall of Terra.

How to look in the atlas
  • Time slider 5.45…6.8, and watch the route Baal → Signus: the Angels were not “late” for Isstvan — they were led away.
  • The “Investigations” lens → “The Geometry of Isstvan V” → step 5: the Drop Site and Signus run almost back to back — a single operation of Horus’s in two places.

Show on the map

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Sources

  1. Fear to Tread (J. Swallow)
  2. Forge World Black Book VIII: Malevolence
  3. Sanguinius: The Great Angel (C. Wraight)
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