"Hello people. I have started my first EB campaign as Carthage and fought 3 major battles. Some of my units have managed to get 'experience bars' and others haven't. However, over the course of the 3 battles there is no rhyme or reason to suggest how a unit achieves an experience bar. It just seems so random.

What factors/variables does the game take into account to compute for experience?

Also I have merged fresh units to the depleted ones which understandably lowers the experience of the unit depending on the amount of new additions merged. Does this also impact on a units better armour and weapons icons?

Gracias."