In close proximity the Iron Warriors heavily mauled the imperial defenders, inflicting crippling attrition on both men and machinery. Thus compromised the imperial line crumbled, and soon the Iron Warriors were followed up by regiments of Librian rebels. The defence of Lazarus quickly became untenable and Launceston reluctantly ordered a retreat. After months of seige, Lazarus had been taken by the loyalists from the rebels. Now with the aid of the ancient astartes the city had fallen in just hours.
In the south of Cartasia the alliance made more gains, with the Iron Warriors defeating the Sky Lords and forcing them to retreat from the Cartal mountains after a closely fought battle. At one point the Iron Warriors were struggling against the heavy armour of the crusade force, and the elite terminator armoured battle brothers. However in the end superior discipline and the heavy armoured infantry of the breecher seige squads turned the Sky Lords' flank, forcing the withdrawal.
By 0105.015M42 the alliance were within touching distance of removing the crusade, and had all but taken the south.