All armies within the current Warmaster system can 
use these rules. 

Clauses.

Undead can only ever "form up" as a direct order
as they have no initiative moves.

Orc and goblins will not form up as an initiative 
order and again must be given a direct order to form up.

Infantry Units with negatives to there orders cannot 
form up, ie trolls etc.

Units that are effected by special rules for psychology
cannot form up. (This does not apply to undead).