Side A charges three squads of Side B's forces. All are involved in the same combat. All of Side B's units are fearless. Side B loses combat by 5 wounds.
No Retreat is on page 44, second column, 4th paragraph; Multiple Combats is on page 41, pursuant section:
"Assault Results"
Every unit on the losing side has to check their Morale (they all use the same penalty, as described in the Morale section).
Since the same penalty is applied to each and every unit, wouldn't a -5 Morale penalty resolve itself as five additional wound on each fearless unit?