Army Pairing is a NPC mechanic where RvR in WAR is based on the conflict between Order and Destruction. However, this main conflict is divided into three destinct sub-conflicts that pit one particular race against another. Each of these army pairings spans a number of zones, forming three frontiers, also known as Campaigns. All races will be able to travel between the frontiers on their army's side, making the forces in each frontier more and more mixed the higher the tier.
The three starting amry pairings are as follows:
Dwarf vs Greenskins
The Empire vs Chaos