What does the +20% bonus from Heavy Infantry Leader, etc. apply to?

What does the +20% bonus from Heavy Infantry Leader, etc. apply to? - Crop anonymous female filling questionnaire when applying for job sitting in employer office

Leadership traits (Heavy Infantry Leader, Light Foot Leader, Cavalry Leader, Elephant Leader) give "+20%" to their respective unit types...

But +20% to what? Morale? Defense? Damage? # of troops you are considered to have for purposes of tactic selection?






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