Overwatch

WHEN: Your opponent’s Movement or Charge
phase, just after an enemy unit is set up or when
an enemy unit starts or ends a Normal, Advance,
Fall Back or Charge move.
TARGET: One unit from your army that is
within 24" of that enemy unit and that would be
eligible to shoot if it were your Shooting phase.
EFFECT: Your unit can shoot that enemy
unit as if it were your Shooting phase (6 to hit).