BITTER ENMITY

The IVs contempt for the Imperial Fists runs deep.
Use this Stratagem in the Fight phase, when an
IRON WARRIORS unit from your army is chosen
to fight with. Until the end of that phase, when resolving an attack made with a melee weapon by
a model in that unit against an Imperial Fists unit,
you can re-roll the hit roll and you can re-roll the
wound roll.