The situation with damage is exactly the same as in the first part (see the author's reference by VDV_forever), if the number of units in the squad does not exceed 10. If the number of units in the squad is more than 10, then the overall picture remains the same, but the damage is [N * (the sum of ten pseudo-random numbers from the damage range of one unit from the squad) / 10], where N is the number of units in the squad.

Don't be lazy, read the article about damage in Heroes in the Reference. Some facts will make sense, for example, it will become clear why a squad almost never deals maximum or minimum damage, or why the damage area is not always continuous.