On 2311.008M42 Snazteef's attacks were unceasing. For weeks now the Imperial Guard had tried in vain to slow his advance but now the Ultramarines waited patiently to make their move. Subordinate commanders in the Imperial Guard were not informed and the Librian 34th Regiment in particular took heavy casualties on the 27th as Snazteef's main force bludgeoned its way through their lines, led by unstoppable Mega Armoured Nobz.
However later on the same day the ultramarines found a gap in the widening Ork lines and, combining a frontal assault with an orbital drop, neatly cut the Orks supply lines and opened a gap over one hundred kilometres wide in the Ork front line.
Jamieson immediately ordered his armoured units, including the 17th Librian heavy tank division, to exploit the gap and hundreds of tanks rushed north before deviating east to cut off the Ork line of retreat. With no supplies and communications the Orks in the pocket began to lose their co-ordination, but still fought savagely. It would be many days before the pocket was mopped up but once it had the orks had been pushed right back to the Tuva Bay where they had landed.