The following rules apply to Swarms:
Ranks
A unit of Swarms is required to be three or more models wide in order to have a complete rank.
Supporting Attacks
A Swarm model may make up to five supporting attacks.
Special Rules
Swarms are subject to the following special rules: Expendable, Skirmishers, Unstable.
Other models can fire through them at targets behind them with no To Hit penalty. However, any Swarm base that is hit by a template attack suffers Multiple Wounds (D6) rather than 1.
Unit Strength
Swarms have a Unit Strength of 3.
Line of Sight
Swarms have a Line of Sight value of 0.