Thinking about the Horus Heresy Siege Assault Battle Group? Get the contents, release date, pricing, and value verdict with an updated savings breakdown review.
The Astartes got a brand-new Horus Heresy Siege Assault Battle Group box, and we’ve cracked it open to see if it’s worth your hard-earned hobby dollars compared to the other bundles out there.
We’ve broken down the contents of the new box, the release date, the updated rules, and the savings so you know exactly what you’re getting before heading to checkout.
Siege Assault Battle Group Box Contents, Release Date & Price
Updated on December 22nd, 2025, by Rob Baer with the confirmed release date and price.
The new Horus Heresy Siege Assault Battle Group release date is January 10th, 2026, with a retail price of $215. That is a five-dollar increase on previous boxes (see below for local currency conversions).
Horus Heresy Siege Assault Battle Group Contents:
- 6x Cataphractii Terminators with volkite chargers
- 6x Cataphractii Terminators with bolters and powerfists
- 10x Breachers
- 1x Leviathan Dreadnought
Siege Assault Battle Group Review
This new Horus Heresy Battle Group packs 23 Marines who came prepared for one thing: smashing through enemy defenses like they owe their Legion money.
Horus Heresy Siege Assault Battle Group List Price: $215 CA$260 AUD$360 €170 £129
| Models | Unit Name | Value |
| 6 | Cataphractii Terminators with volkite chargers | $69* |
| 6 | Cataphractii Terminators with bolters and powerfists | $69* |
| 10 | Breachers | $73.50 |
| 1 | Leviathan Dreadnought | $89 |
| Horus Heresy Siege Assault Battle Group | ||
| Total MSRP: | $300.50 | |
| Savings Versus Box Price: | $85.50 | |
Value Trap
*Pricing estimate based on recent releases, but could end up being a box set of 12 instead of 10 when released seperately. It could also end up being a box of six due to Games Workshop’s shrinkflation, at a price in the upper $ 70s.
Is the Siege Assault Battle Group Set Worth It?
Well, they only raised the price on this five dollars compared to previous boxes, which makes this a great deal! Not only do you get a ton of new minis (yes, this is definitely another GW paywall), but you more or less get the Leviathan Dreadnought for free.
If you want everything inside, this will be the first place to grab the minis, and you’ll save a bunch of cash.
How Many Points Is This?
Well, if you’re wondering about the Horus Heresy Siege Assault Battle Group points? In games of Horus Heresy, this box is around 750-800 points.
What to Buy Next For Your Siege Assault Battle Group?
The Spartan Assault Tank is a no-brainer if you want to deliver those Breachers right into the enemy’s teeth. A Praetor or Centurion gives you that classic Heresy hero swagger to lead the charge, and a Contemptor Dreadnought pairs nicely with the Leviathan for a proper walking wall of metal.
If you’re really leaning into the siege vibe, stack up some Rapier Batteries or Heavy Support Squads to rain down punishment from a distance. Basically, if it looks like it could punch a hole in a bunker or crush a tank underfoot, it’s probably your next smart buy.
Final Thoughts on the New Horus Heresy Siege Assault Battle Group
That’s the rundown on the Horus Heresy Siege Assault Battle Group, and it’s looking like a solid score for anyone ready to bring the thunder to the Age of Darkness.
Between the chunky Terminators, that gorgeous Leviathan, and the Breachers holding the line, it’s hard to go wrong here for both Warhammer 40k or Horus Heresy.
Where To Buy Your Siege Assault Battle Group Battle Group Box
