Games Workshop unveils Horus Heresy Siege Assault Battle Group

Games Workshop surprised the Horus Heresy community on December 21 with a preorder listing for a Siege Assault Battle Group that assembles 23 models aimed squarely at siege and breacher play. The boxed set bundles twelve Cataphractii models from the Terminator era, split into two six model teams with distinct loadouts, ten upgraded Breacher Squad Mk III Legionnaire figures with extensive customisation for bunker busting roles, and a Leviathan Siege Dreadnought equipped with a purpose built siege drill. The variety of weapon options and the presence of a siege focused dreadnought make the box a compact toolkit for narrative and matched play siege scenarios.

Detailed model breakdown matters for gamers and painters alike. One Cataphractii six pack comes with volkite chargers and power weapons, while the other carries combi bolters and power fists. The ten Breacher Squad Mk III Legionnaires are presented as highly customisable, which opens immediate opportunities for kitbashing and tailored army themes. The Leviathan Siege Dreadnought provides a centrepiece model that translates directly to tabletop functions in Horus Heresy era lists and to display projects on the workbench.

Availability is being managed as part of a holiday product cadence and timed retail strategy. Preorders will begin Saturday 27 December 2025. Games Workshop also flagged a series of timed drops across Warhammer stores and Warhammer Community channels over the Christmas period. Made to order terrain will go live on 25 December, select Boxing Day miniatures will be available in stores on 26 December, and some items will reach online shops later in January. That timing creates a narrow window for in person purchases on Boxing Day and a potential surge for the preorder launch on the 27th.

Expect strong demand for a boxed set that combines ready to paint units with immediate tabletop relevance. For players building siege themed lists, for painters seeking richly detailed shoulder pads and plate work, and for collectors looking for limited seasonal stock, this release will have practical impact. Plan your drops accordingly, check local Warhammer stores on Boxing Day, and prepare to preorder on the 27th if you want to secure the set and related holiday items.