Command Re-Roll

WHEN: Any phase, just after you make an Advance roll, a Charge roll, a Desperate Escape test or a Hazardous test for a unit from your army, or a Hit roll, a Wound roll, a Damage roll or a saving throw for a model in that unit, or a roll to determine the number of attacks made with a weapon equipped by a model in that unit. If you are using fast dice rolling, this Stratagem can still be used after rolling multiple rolls or saving throws at once.
TARGET: That unit or model from your army.
EFFECT: You re-r