- Units in Heroes 3

Allow me to disagree! :)
As follows from the general trend - average damage fluctuates within 1/2-1/5 of a unit's HP, meaning that after a retaliation strike, the stack strength will decrease by an averaged mean value :) 1/3.5, i.e., around 30%, and thus the second hit will be delivered with 0.6-0.7 of the original strength.

1. You've overreached here :) It turns out that with every retaliation, the number of units in a stack decreases by 30%... But that's not how it works... After all, damage dealt by a unit and damage dealt to a unit are not the same thing...

2. Regarding the 1.75 coefficient for the double strike, I take your side... We've sorted it out, so to speak... Everything is correct.