For the damage reduction calculation are the strongest units considered first and then the weaker ones? For example, say I have a stack of 20 cavalry and 20 infantry attacking a stack of land units. Will the 20 cavalry apply full damage and the damage for the 20 infantry fall off as it approaches 50? I assume the damage is sorted like this, but would like to verify. Thanks.

Damage reduction for stack sizes 21 to 50.
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FMD
Approved the thread. -
According to the tooltip, you are correct. The 20 cavalry will deal full damage. the 20 infantry reduced damage.
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yes, The strongest units contribute to the damage first,
An Army of 50 tanks and 50 inf would have the same damage as an army of 50 tanks only. -
Yes, that is my understanding.
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So if I attack with 50 cavalry units and 50 armoured cars - so it means that cavalry would attack and cars would defend?
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Yes, assuming the HP was high enough to make cav the stronger attacker they would be the only attacking units. All units in an attacking stack will share the defensive damage returned, based on their unit count and damage area.