Resources are spent to increase an area's fortification value every time a defending force is dispatched. If resources hit 0, no more temporary items can be purchased. But more importantly, the defending forces can no longer repair the fortifications when they are initially dispatched, which means the defenders will retreat more often, allowing the enemy army to gain influence easily, until the fortification is repaired by a engineering unit or through Campaign Ops. Resources must first be procured through the Campaign Ops code named Stock and Awe. However, the resources serve no purpose sitting in allied stockholds; thus they must also be safely transported to the necessary allied fortification through the Campaign Ops code named Crimson Domino, or by maintenance units delivering a supply run.