Impaler harpoon

A unit may re-roll Charge Rolls when attempting to Charge an enemy unit that has suffered one or more Hits from a weapon with the Impale special rule caused by one or more models in the unit for which the Charge was declared in the same player turn. This takes effect even if no Wounds are caused by the Hits.
If one or more Wounds are caused by a weapon with this rule, the affected unit decreases its Initiative characteristic by 1 until the end of the subsequent Assault phase.