Covering Fire

Once per round, when your unit or an allied unit disengages from an enemy unit, including the
Retreat or Withdraw Tactic, or a unit that routs
or is destroyed, you can make a ranged attack
against the enemy unit from which it is trying to disengage. If your attack hits, you inflict 1d4-1 Casualties and your allied unit gains a +1 bonus
to DV and to opposed Morale checks made to disengage.