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501st Siege Company


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Legio VII

Legio Name:

The Imperial Fists Legion




The wall breakers








The 501st Battalion of the 7th Legion was raised very late in the Great crusade, it was created due to the Imperial fists focus on defensive tactics and holding ground but their apparent lack in besieging fortresses and taking ground. Of course as a Legions Astartes they were adept in all forms of war despite their specialty, but a niche siege capability was missing in the legion and as the wars and battles of the crusade ground down to a quagmire of sieges and assaults this was a specialty sorely needed.

So the 501st was raised under the banner of the 40th Siege household (40th chapter), taking the 7th legions knowledge of how to defend a fortress into how to besiege and capture one, and to the envy of the Iron warriors legion the 501st was very, very good at its job. This among many other slights was just another straw atop the Iron Warriors back, seeing their arch rival legion excel in something that should be an Iron warriors specialty. At the time of the Heresy the 501st was actually on operations with the Iron warriors 6th Grand company. The battalions 4th Siege company was embedded to the Iron warriors 6th Grand company with the task of besiegeing and routing rebel forces held up in the last bastion standing on the Planet designated IV-76. As the Imperial Fists were embedded into the Iron Warriors their chain of command was reliant on the Iron Warriors for information, hence they were not even informed of the betrayal of Horus. The 6th Grand company had watched the 7th legions 4th Siege Company excel time and time again in this bloody war for IV-76 and once the master of their legion had sent word to the 6th Company it was obvious they would turncoat.

The assault on what was now fortress IV-76-B18 (B18 for short), began in the early hours of the early days of the heresy. The Iron Warriors 6th Grand company composed the battle plan, putting it to the Imperial Fists 4th Siege company that they should make the first wave since their succsess elsewhere has been so great. The prideful 7th legion Astarte's ego's swelled at this proposition and the 4th's Commander, attached from the greater 501st itself, Praetor Gadreel Demeter accepted this offer. The 4th began the assault and in their typical fashion methodically and purposefully advanced on their objectives, the mighty and ancient Leviathan Siege Dreadnought Coron Dios Finally layed his Siege drill into the mighty bastions walls and when the Breacher Marines finally caught up, the 4th had breached the walls. Now was the time the 6th Company was meant to advance and push through the rest of the fortress, but alas as the 7th legion's Astartes called for help and turned to expect to see their brothers advancing to help them, all they witnessed was their brothers advancing with bolters raised. It was a slaughter, the 4th company lost a 3rd of its men in the opening firefight. Caught between the rebels and the Iron warriors the only way to survive was to push deep into the fortress, fighting two running battles at once the Imperial Fists slaughtered their way through the fortress to put a gap between them and the Iron warriors. Confused and taken completely by surprise the 4th company was in tatters both mentally and physically. It was only due to Praetor Demeter rallying his men they were able to form a defense. After fighting to enter the fortress they now had to defend it against their former brothers.

The 4th company was able to hold out against The Iron warriors 6th Grand company. Showing that while the company was created for siege, all Imperial Fists are masters of defensive warfare. The Stern and level headed leadership of Praetor Demeter meant that him and his men were able to hold out long enough until an Imperial fists battle fleet was able to arrive, the Entire 501st Battalion landed on the planet and was easily able to decimate the Iron warriors. Now Gadreel Demeter instead of leading the 1st Company as most Praetors do has chosen the 4th company as his own, after the experiences they shared the bond between Gadreel and his beloved 4th Company is unbreakable.

Now the 501st with the 4th Siege company at its head wage war on their former brothers and will not rest until the treacherous traitors are brought to heel for their betrayal. Especially the now hated Iron Warriors legion, anywhere these hated adversaries can be brought to battle by the 4th company they are.


The 501st battalion joined the raging inferno of the horus heresy under the orders of their lord Primarch Rogal Dorn. While the majority of the 7th legion returned to the sol system to prepare for the coming of horus, it is not to be said that the Imperial Fists missed out on the war. Several Chapters were dispatched to hold key systems and form a vanguard to keep the traitors at bay and to buy their brothers back in the sol system much needed time to prepare. Units such as the 32nd Vanguard assault household are other such examples of 7th legion Chapters sallying forth to hold back the advance of the traitors. The 501st battalion was part of the 40th Siege household (40th chapter). The entire household was ordered to reinforce several sectors to the galactic north of Terra and the 501st served largely in the defence of the Eglurn system with their brothers in the 32nd household.

As horus relentlessly advanced on the loyalists the entire chapter and so therefore the 501st battalion was recalled to Terra, with the 4th company at its head, to mount that famous defence. Before this however the 40th Siege household and its battalions were active in a great many battles during the heresy, and won a great many wars against the traitors.

The Companies last full strength Order of battle is as follows(note the 4th has not been at full strength for most of the war):

Company Command: Praetor Gadreel Demeter (Commander of the 501st, 4th company has become his personal company.)

Centurion Praevian Lok ( Company captain Now 2nd in command to Demeter)

Centurion Julius Triarii (Consul Siege breaker)

Command squad Hephastea'l (Chosen terminator squad, Demeter's honour guard)

Company elite/support:

Ancient Rydon (contemptor dreadnought)

Ancient Decanus (contemptor dreadnought)

Ancient Daros (contemptor dreadnought)

Battery 501-4-1 (3 Quad mortar support battery)

Rapier battery Tacitus ( 3 rapiers)

Rapier battery Gunjar ( 3 Rapiers)

Terminator squad K'rel

Veteran squad Morantar (10 Veteran Astartes and Rhino)

Company line units: Breacher squad Braantar (20 breachers)

Breacher squad Avides (20 Breachers)

Tactical squad Decius (20 Astartes)

Tactical squad Sare (20 Astartes)

Tactical squad Sentre (20 Astartes)

Tactical squad Cornilius (20 Astartes)

Tactical support squad Scipio ( 10 specialist Astartes)

Tactical support squad Kanake (10 specialist Astartes)

Company Heavy support:

Spartan assault tank 'Fist of Dorn'

Legion Vindicator laser destroyer squadron (2 vindicators)

Heavy support squad Coris (10 Heavy Astartes)

Heavy support squad Mero (10 Heavy Astartes)

Ancient Arael (Leviathan Siege Dreadnought)

Ancient Kyrev (Leviathan Siege Dreadnought)

Typhon heavy Siege tank 'earthbreaker'

Notable engagements:

003.009 War for the Eglurn system. The 501st battalion was garrisoned within the Eglurn system during the heresy. They are currently in the middle of a bitter war for the system engaging multiple traitor legions at once, Notable encounters with the Death guard and Emperors Children and almost al o the traitor legions at one point or another. Larger Imperial fists assets are also engaged in the system and the battle is currently undecided.

(*Date Fragment lost*) The war for Makara. A short But large scale engagement during the shadow war period of the heresy. An extremely decisive victory for the loyalists and the 501st.

(088.009.M31) The second Golloch war. An undesisive grind of multiple legions engaging in all out warfare. The 501st found themselves again fighting within the Cambrius sub sector for this engagement.

Combat Reports for L-VII-2056


Northern Front - Battle of Eglurn System
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The Eglurn System is on the outer reaches of the Cambrius Sub-Sector. Like most the systems within ..→

The Second Golloch War
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Prelude to War

The Golloch Cluster is a nebulous region of space containing thousands of ..→


Battle Name Date Planet Battle Outcome Battle Summary
Northern Front - Battle of Eglurn System~1484570644 033.009.M31 Maestea Loyalist

The imperial fist garrison on Maestea consisted of a full battle company of the 501st battalion. These legionnaires stood ready, after the recent traitor advances in the system, to react to anything ..→

Northern Front - Battle of Eglurn System~1484878910 052.009.M31 Maestea Unresolved

Prelude to war: After Being denied a foothold the first time The sons of Barbarus were not a legion known for simply giving up, Their Demeanor was the exact opposite. The 14th Legions fleet arrived ..→

Northern Front - Battle of Eglurn System~1489224330 003.007.M31 8 March 2017 Eglurn Loyalist

The deathguard had been held off, making up the main bulk of the assault on Eglurn the 14th legion had thrown themselves against The Imperial fists of the 501st only to be repelled. However this ..→

Northern Front - Battle of Eglurn System~1489313738 003.007.M31 Eglurn Loyalist

The Deathguard attempted for a 3rd time to assault the capital city of Eglurn, Eglurn Prime. They launched a massive infantry assault against the weary 7th legion defenders. The Imperial fists ..→

Northern Front - Battle of Eglurn System~1491081144 249.009.M31 Iaethea Traitor

The planet of Iaethea had seen some minor battles since the breaking of war within the Elgurn System. The Imperial Fist had called on other legions to try and stop the traitors before the system ..→

Northern Front - Battle of Eglurn System~1492920226 307.009.M31 Eglurn Loyalist

Numerous times the traitors had attempted to gain a foothold upon Eglurn, and most of the time they were driven back by the stalwart Imperial defenders.

On this occasion the devious 3rd Legion had ..→

Northern Front - Battle of Eglurn System~1492922891 310.009.M31 Maestea Loyalist

The war for The Eglurn system had been long and bloody and for the most part the loyalist defenders had seemed as if they were winning. But as more and more Traitor forces and legions made their way ..→

Northern Front - Battle of Eglurn System~1494934668 003.007.M31 Maestea Traitor


Northern Front - Battle of Eglurn System~Battle for Eglurn Prime 079.009.M31 Eglurn Loyalist

Unsatisfied with the progress of the warmasters forces in the Eglurn system, Mortarion himself headed a bold plan to place pressure on the Imperial defenders. The Gene father of the Deathguard ..→

Northern Front - Battle of Eglurn System~No more Hiding 003.009.M31 Iaethea Traitor

After their first encounter with Imperial Fist the Emperors Children could no long sneak into the system for supplies. With their cover blown on their departure out of the system to meet up with ..→

Northern Front - Battle of Eglurn System~ 1st battle on Draonides 342.009.M31 Draonides Loyalist

As part of 1st Captain Sigismund's master plan to retake the Eglurn system from the clutch of the traitors he had realized he must secure the Solar power manufactories of Draonides. Unbeknownst to ..→

Northern Front - Battle of Eglurn System~ Battle of Vosculia 003.007.M31 Vosculia Loyalist

The War for Eglurn raged on like a wildfire. Bloody and decisive battles were being fought all across the sector, and after a ferocious traitor onslaught the Imperium was finally taking the fight to ..→

The Second Golloch War~Assault on Star Port EN-BE551N 164.009.M31 Gaul Draw

March - Geno Five Two

At the onset of the Heresy the Techno-archivists took full advantage of the emerging civil war. Delegations from Mechanicum agents loyal to the Warmaster had been ..→

The Second Golloch War~The Death of Paterswold 088.009.M31 Paters World Loyalist

February - Eye of Horus

Horus' great betrayal hit the rulers of Paterswold simultaneously with the news that a group of twenty industrialised worlds in the cluster's galactic north had sworn ..→

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