Most flyers are large monsters but some units of troops can fly: Harpies, for example. Where flyers fight in units the same rules apply, but the unit must remain whole just like any other unit. So, the entire unit will charge, fly high, and so forth.

Flying units must keep to a formation like other troops. However, if the models are mounted on flying bases or have very broad wingspans, it will be impractical to arrange them base-to-base to manoeuvre in the conventional manner. Instead, they are placed next to each other as closely as possible and individual models move freely in order to change formation or face a different direction.