Slitherine

What determines the granting of experience during battle for units.
I have conducted several practice battles and I cannot see any regularity.
I don't see a connection with the damage dealt, damage received, battle won, or the combat value of a unit.

Traditionally in Ageod games, a unit that causes damage increases in experience. If it loses strength, then fresh recruits are eventually added to the unit and the xps are averaged. So it loses experience. Thus, any unit that both causes damage and takes damage may not improve noticeably. If you Ctrl+cursor over a unit card, you can see its exact experience point total.

now you see the connection yet? I think the answer is quite easy to understand, it's also like in the real life jigsaw puzzle