As described in the Warhammer: the Old World rulebook, the number of some of the available units is restricted. Under Combined Arms army rules, additional limits apply to any units and characters that are not otherwise restricted by the army composition list you are using. This encourages players to create tactically diverse armies, rather than relying too heavily upon a single unit type or the over proliferation of a certain type of character. Unless a unit or character is already restricted in some way by the army composition list you are using, a limit of:

• 0-3 applies to Characters

• 0-4 applies to Core units

• 0-3 applies to Special units

• 0-2 applies to Rare and Mercenary units

For example, if you are fielding an Empire of Man army using the Grand Army composition list, you can only include 0-1 unit of Veteran State Troops per 1,000 points, but you can field as many units of Free Company Militia as you wish, as Core choices. When writing your muster list under Combined Arms rules, you can only include 0-4 units of Free Company Militia. The limit on Veteran State Troops remains unaffected.

These numbers increase by one for every full 1,000 points of game size above 2,000 points. Units taken as Detachments do not count towards these limits.

Note that these limitations do not apply to named characters and that, under Combined Arms army composition rules, mercenaries are always permitted. Allied contingents are permitted at the organiser's discretion.