Mantlets
(Rule)Description: Units with mantlets must place them on separate bases in front of the unit. Every model in the front rank must have a mantlet base in front of it, which must also be set up within the army's deployment zone. A unit with mantlets gains a 4+ armour save against missile attacks to its front arc (except attacks that fire like a stone thrower). However, if the unit moves or reforms during the game, the mantlets are removed from play.