Here are a few major sticking points for me. (this generally for western european units)
! Remember it's not about killing them all, it's about losing only a few men and getting them all to route.
For foot archers start out in from of the rest of your men because they are more accurate in front.
Never have javelin-men attack men on walls, they are useless in that capacity. They won't kill hardly anyone.
Put your horse archers or javelin men on the far left and right of your formations. Keep them out of trouble. Have them pepper the enemy and keep them out of trouble.
The PC sucks at handling javelin men, control yours manually - swoop in hit em hard, pull out, do it again etc etc
Mounted crossbowmen are great too! But, here is the thing, their attacks are not as strong. But, they have more armor penetrating capability and much more ammo!.
Attack strong units with little armor first when using your horse archers to get the most bang for your buck, a armor-less unit that carries a big axe for example.
Remember defense is separated in to 3 areas, skill, armor and shield.
in an attack from the front you have to factor in all of them. From the sides just skill and armor. (so like 9 instead of let's say 12) From the back only armor (so lets says 60)
This is why attacking from the back is the thing to do. (when possible, especially with ranged cavalry units)
Charge bonus: It's simple 6 attack + 4 charge = 10 attack when you first charge.
2 handed units have a powerful charge but, attack slow (1.25 speed to be exact (higher being worse) ) in a prolonged battle they are not as good as their stats show - like 25 worse than their attack.
Never attack spearmen with knights (mounted knights that is), they may win, but they will take an unneeded amount of damage.
What you should do is move your knights around slowly even creep towards the enemy and pull our if you must.
Like lets say their archers are out in front - you charge them, they run and hide behind their spears - turn around!!! - this is not a loss, the archers are in back now and much less accurate, mission accomplished.
Like I said with the archers, lets say you're attacking a unit with your knights ( some axemen) and the axemen move back and to the left, all the while some spearmen move forward and to the right - your men are going to hit spearman - pull them out!
Elephants are afraid of fire and javelins - use these to scare them and cause them to attack their own men!!
I generally have my infantry like this
And here is why!!!!
It's not about just sheer elite units, it's about the best bang for your buck. 1 elite stack is not as good as 2 well rounded stacks of elite-mercenary-milita-pesants.
I like to put my elite infantry in front (usually dismounted knights) Lets say I have 2 of them down in front
To the diagonal left and right some sort of "slam" group as I like to call them - cheap armor-less units with a strong charge.
To left and right of all of them spearmen.
Here is why, you use your elites to absorb arrows and engage enemy infantry, once they are in the battle you can use your slam units to slam against the enemy - with their powerful charge their is a good chance that they might route.
The spearmen are there in case a knight tries to rush you, if they do, move the spearmen in to protect the other 4 units.
The computer likes to abuse artillery - they use it way to much, there is an easy way around this thou.
Use a very fast unit (remember there are like 4 horse speeds General's unit - Knights - Pony - Fast pony. is possible use fast ponies) such as border horse, alan light cavalry, Hobilars etc
and go WAYYYYY out to behind and to the left or right of their formation, after the battle gets hot they will more more men away from their artillery and you can swoop in and make quick work of them.
Trust me it works like a charm.
Recruit Alan light Calvary when you are in their area, they are one of the fastest unit in the game and no unit with their speed has such a strong attack or charge.
The way to take out a enemy horse archer is simple - since they are usually moving around and not near any friendly units (other than other horse archers) Simply take a fast units such as border horse, alan light cavalry, Hobilars, or even a slightly slower cheap fast unit such as merchant Calvary militia or mounted sergeants.
Point at the enemy archers with these units and charge!
They will usually run away for a while, if not the entirety of the battle, eventually they will engage in hand to hand and chances are you will only lose a few of your men before they decide to attack, then you will slaughter them
Bring about 1 siege artillery unit to every field battle for every 5 to 10 regular units - according to your taste. Leave a fast-strong cavalry unit back their to protect them. Like a mounted sergeant
Sometimes you will try to charge a distracted unit with your knights and then they notice! turn around and run away, they will chase you for a bit and not catch you since they are infantry - when they give up, turn around and charge them fast! you can usually get them
That's all I got for now, I'll add more if I think of some.
