Here's some battles to just illustratate the point (ok I do have the advantage of defending a river crossing) - batteling the ptolyemys without any archers ends up being a "turkey"shoot. Its really unbalanced, esp when fighting against an army like mines where theres a good mix of units - esp long range archers, horse archers and heavy cav. On a river crossing battle like these.. my units are practically immune but ff the AI had recruited archers, artillery and heavy cav .. it'd be way harder but more balanced.
Selecuids Campaign - BI/HH/0 turn.
River Crossing battles:
Battle in the Middle East _ defending from high ground.
TTrouble