Experience and it's affect on units.

Experience has a fairly large impact on units. Each level of experience does the same thing for all units. Each unit; artillery, infantry, cavalry, and ships get these bonuses (when applicable, melee troops can't get a bonus to accuracy and reload)

+2 Accuracy
+2 Reload
+1 Melee
+1 Defense
+1 Morale (every 2 levels)

There is a maximum of 9 levels. So a maxed out unit gets +18 accuracy and reload, +9 melee, +9 defense, and 4-5 morale bonus.

Experience I find, is best used on artillery pieces, they have a default reload speed of 5. So each level of experience increases that by 2, which is quite a dramatic increase in rate of fire. Essentially, one experienced artillery piece is better than two, so long as it's safe.

Hope it helps.

To battle!!!!!