Siege Assault Battle Group – A Closer Look
It’s been a strong year for Terminators overall. Between the raw aggression of the Wolf Guard and the imposing bulk of the Saturnine pattern, Tactical Dreadnought Armour has felt properly important again. The Siege Assault Battle Group for The Horus Heresy continues that trend, but leans hard into a very specific battlefield role: slow, methodical, and brutally effective siege warfare.
This isn’t a flashy, high-speed force. It’s a toolbox designed to walk into gunfire, tear down defenses, and keep going.
Cataphractii Terminators – The Anvil Returns
The real headline here is the new Cataphractii Terminators, and their first availability as full plastic kits immediately makes this box attractive.
Cataphractii have always occupied a distinct niche in the Horus Heresy: they’re slower than other Terminator variants, but far harder to shift. The added shield generators reinforce that identity, making these units ideal for advancing under fire, anchoring objectives, or forcing opponents to commit far more firepower than they’d like.
What stands out in this release is how flexible the loadouts are:
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The volkite-and-maul squad excels at chewing through infantry while still threatening elite targets.
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The combi-bolter and power fist squad offers a more traditional, adaptable role, with access to specialist tools like a chainfist or heavy flamer.
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Sergeant options are generous, letting you tailor each unit’s role without feeling locked into a single “correct” build.
Taken together, these Terminators feel less like a blunt hammer and more like a mobile wall—they advance, absorb punishment, and dictate the pace of the fight.
Breacher Squads – Unexciting, Extremely Effective
Breacher Squads rarely steal the spotlight, but in siege-focused armies they’re some of the most dependable infantry you can field—and this box reinforces why.
The combination of MkIII Legionaries and the new Breacher upgrade frame gives you a unit that’s clearly meant to hold ground and refuse to yield. Boarding shields, specialist tools like the graviton gun, and strong Sergeant options all point toward sustained, grinding engagements rather than quick assaults.
On the table, Breachers shine in:
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Zone control
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Narrow corridors and urban boards
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Supporting Terminators by occupying objectives the heavier units have cleared
They may not be glamorous, but in siege scenarios they’re exactly what you want backing up your elite units.
Leviathan Siege Dreadnought – A Problem Solver
If the Cataphractii are the anvil, the Leviathan Siege Dreadnought is the wrecking ball.
Armed with a siege claw and drill, this thing exists to remove problems—fortifications, armored targets, or elite infantry caught in the open. Leviathans already have a reputation for being oppressive in the right context, and this loadout leans fully into that identity.
From a gameplay perspective, it fills a crucial role:
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Forces opponents to respect its threat range
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Draws fire away from Terminators and Breachers
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Provides a reliable answer to hard targets that infantry struggle with
It’s not subtle, but it doesn’t need to be.
Hobby Value & Transfers
Beyond the models themselves, the inclusion of four large transfer sheets adds real hobby value. With over 2,000 decals combined, this box supports detailed Legion markings across an entire army, not just the contents of the set.
For players building or expanding a Horus Heresy force, this is one of those quiet additions that ends up saving time and money later.
Made to Order Terrain – Worth the Reminder
Alongside the battle group, a selection of classic terrain kits is returning as Made to Order items. These are direct-only and won’t be available through third-party retailers, but they’re worth calling out due to how useful they are for Heresy-era boards.
Industrial pieces like the Generatorum Hub, Transterranic Gantries, and Macroplasma Batteries remain some of the best options for building dense, thematic siege environments or display boards that actually match the scale and tone of the setting.
Ordering Window
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Opens: Thursday, December 25th
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Closes: Monday, January 12th, 2026 at 8:00am GMT
You can find more info about that terrain here.
Final Thoughts
The Siege Assault Battle Group isn’t trying to reinvent the Horus Heresy—it’s refining one of its core themes. Durable elites, methodical infantry, and overwhelming siege engines come together in a force that rewards patience and positioning rather than speed.
If you enjoy slow advances, grinding firefights, and armies that feel like they’re built for prolonged wars of attrition, this release delivers exactly what it promises. It’s a strong start to 2026 and a clear signal that Tactical Dreadnought Armour isn’t going anywhere anytime soon.
