I have started to notice a trend in my games. Generally as I build up I go with an entirely light infantry retinue (because the AI mostly looks at numbers when considering factions and war decs). As time progresses and I get 200-250 years into the game so 900-1000AD I really start to struggle with battles. A good case of this was yesterday I lost a few battles were of 15k (me) vs 10k that I would lose. The composition would be nearly identical except I would have several thousand more light infantry (from the retinue), all my commanders would be >16 martial and the AI had none, I would also be defending in mountains and get totally creamed.
My knowledge of the combat system isn't great but I am guessing this was down to tactic selections but I don't get why I should be losing these battles because we have the same amount of heavy infantry, cavalry etc but I just have way more light infantry. In any case at this point I usually start creating a heavier retinue and it usually helps. However, should I even be losing these battles and are tactics too influential on combat to the point that they overcome terrain, good commanders and numerical superiority?
My knowledge of the combat system isn't great but I am guessing this was down to tactic selections but I don't get why I should be losing these battles because we have the same amount of heavy infantry, cavalry etc but I just have way more light infantry. In any case at this point I usually start creating a heavier retinue and it usually helps. However, should I even be losing these battles and are tactics too influential on combat to the point that they overcome terrain, good commanders and numerical superiority?