Power Level: 60.
Mission: Supplies From Above.
Agendas: Cull The Horde, Know No Fear and Priority Target.
Opponent's Agendas: Hunt and Slay, Kingslayer, Reaper and Tyranid Attack.
After the recent defeats, the Hive Mind now proceeded to marshal the local Tyranid forces, bringing up more bio-organisms and synapse creatures. The Hive Mind formulared a new play, where it's armies would feign an attack upon the Imperial command base from the south east while the main effort would actually be directed on the fortress area's southwestern flank.
The Tyranid artillery strike began with a preparatory bombardment by larger organisms, continuing through the day. Imperial counter-fire was hampered by limited supplies and ammunition. The Turanid assault was launched on the second day, with three pincers of organisms thrusting against the eastern and western sectors of the defensive perimeter. At the same time, a diversionary attack launched from the north.
The first Tyranid units, with monstrous support, breached the defensive line early in the morning, and during the following hours the Imperial defences were broken in five places. As a result, the defending Rift Wardens pulled back immediately to avoid encirclement. Rather than taking the fight to enemy, as they would have preferred, the space marines were forced into a defensive role. By the next day, the Tyranids had largely overrun the fortress.
As a consequence of the Tyranid advance, two further Imperial fortresses were cut off within 16 hours and isolated from reinforcements. As night fell, the fortresses ceased firing and their garrisons abandoned them, trying to escape the great devourer and regroup. The Rift Wardens retreated to their command cruiser to plan a new counter-attack.