The Oran attack was just over 100 men total (52 British troops plus about the same in ship's crew with 33 US Navy and Marines in addition). About a third were killed or wounded with the rest surrendering. All-in-all these operations amounted to less than 1/10 of 1% of the Allied manpower involved in the landings.
All of the ships used were older vessels cut down, stripped, and re-armed for this mission. Their loss was insignificant.