I have no problem, at all, when fighting forest battles on the defensive, I escape with minor casualties because I hide my archers all around the forest (In two flanks of where I know the enemy will come from), protected by infantry and my cavalry hidden in edges of the forest, ready to flank, I put my general (Unhideable) in the place I want the foe to strike, and I place archers with stakes in front of him, in addition to pikemen/spearmen, it's just like shooting sitting ducks.
I am having an extreme problem, as of late, with forest battles in which I am the assailant... I usually win all my battles, I am good with those, but in forest battles... I'll compare:
10% cavalry casualties. 50% cavalry casualties.
20/30% infantry casualties. 60/70% infantry casualties.
5/10% archer/artillery casualties. 10/20% archer/artillery casualties.
General dies only 1/15ths of the times, even that's rare. General dies 1/5th of the times!
(Statistics from 10 custom battles I did in forest terrain, completely even armies)
As you can see, I clearly have a problem. My best strategies don't work, and the AI easily flanks me! It utterly annoys me at times, I mean, sometimes I manage to escape with such a win that is worthy of gods, and sometimes I manage to escape with such a narrow win that is worthy of demons, and sometimes I get defeated so hard that I lose over half my army!
I need help, post your strategies for OFFENSIVE forest fighting, please.