Event · M41
Tarsis Ultra
The Tarsis Ultra campaign was a forty-first-millennium Tyranid assault on Ultramar, in which Ultramarines under Uriel Ventris opposed the swarm. It is recorded as one of the engagements in which the realm of Ultramar, the Ultramarines’ domain in the Segmentum Ultima, came under direct pressure from the Tyranid hive fleets. The world of Tarsis Ultra is the site to which the event is bound on the Orrery map, and the timeline entry sits in the forty-first millennium, within the wider period of Tyranid incursion against the eastern Imperium. Accounts of the exact date differ in how they are framed, and no precise year is asserted here beyond the millennium. The cause of the fighting is the arrival of Tyranid forces in the Ultramar region, drawn by the biomass of settled, populous worlds. The principal Imperial figure associated with the defence is Uriel Ventris of the Ultramarines, whose part in the campaign is the pairing recorded in the timeline hook “Ventris vs Tyranids”. The Chapter’s forces, together with the planetary defenders and Imperial Army units of the region, are described as meeting the swarm in a sequence of engagements rather than a single decisive battle. The full order of battle, the identity of every synapse creature involved, and the exact sequence of engagements are not established in the material reflected on this site, and are not supplied here. In its aftermath, the campaign is remembered as a demonstration of the Ultramarines’ ability to defend their own domain against a xenos threat that overran less well-prepared systems, and it forms part of the longer record of the Tyranid advance towards Macragge and the surrounding Ultramar worlds. For readers using the graph, the useful neighbours are Uriel Ventris and the Ultramarines as the principal actors, the Tyranids as the opposing force, and Ultramar as the region in which the event is set. Contemporary Tyranid actions in the same millennium provide the broader context, but Tarsis Ultra should be read as a distinct episode, whose consequences are limited to what is attested rather than extended by inference.
See where Tarsis Ultra occurred on the galactic map in the 41st Millennium.