Make sure you get around 15 units of any kind of archer/horse archer, the stronger the better. In most cases you can get 15 units of fully upgraded archers/horse archers for about 20-40K. Otherwise you will have to make sacrifices to get all of your archers as strong as your budget will allow. I happen to like Archer Auxilia/cavalry auxilia, they are fast with light armor instead of just shirts. Otherwise, you can pretty much get any kind of archer. Then you should probably get 3 units of spearmen/pikemen, definately as strong as your budget will allow. This is going to be the group who will keep you alive during cavalry charges. Lastly, you should get 2 onagers/heavy onagers. This will be useful for "Testudo Bowling" for those pesky legionaries.
Second, deployment. Keep your archers back away from the enemy, but make sure the enemy deployment box is about in the archers range. This will allow your archers to fire on the enemies at far enough range so they are not immediately rushed. Otherwise, you can put them how you like. Loose formation is useful near the outside, as I in many occasions have found that sometimes archers will shoot the guys standing right in front of them. Loose formation will prevent this. Loose formation also gives the surviving archers a chance to flee before too many are killed, assuming that the enemy even makes it to your army without suffering extreme morale crises’. Near the center, keep archers at tight. Put your spearmen/pikemen right in front protecting them. Onagers should obviously be in the back.
Like this:
s=Tight archers
S=loose archers/horse archers
P=Pikemen/spearmen
O=Onagers
-=space
-------------P-P-P-----------
--S-S-S-S-SsssssS-S-S-S-S--
---------------------------
-------------O---O-----------
Lastly, battle. With all of your guys pelting the enemy with 400+ arrows, it most likely will hurt them immediately. If the general is in a conveinient location, aim for him. If it is too risky, and your onagers have nothing better to do, pick him off with them. Whatever you do not kill in the first barrage will probably charge you, stand your ground. When you kill their general, the battle will be much easier. When you run out of arrows, HOPEFULLY the army will be damaged enough for a mild-moderate mop-up job by melee archers. Cavalry Auxilia are useful even after they run out, they become like regular cavalry I think.
Cavalry Auxilia aren't "true" horse archers, as they use spears, but I'm afraid I like using Romans so theey are all I know of...
This strat ought to work for most-all balanced armies, about the only thing you have to watch out for is an all-cavalry army. Which to avoid that just "act like an idiot and 'blab about your "Invincable All-Spearmen army"'"...
EDITS: Took out unneccesary phrases and phrases that I considered either "braggy" or treating the readers like 2 year old newbs... [This message has been edited by RTW_GamerGuy (edited 01-12-2005 @ 10:29 PM).]
""Sir, they have only missle troops. What do you recommend?"
"Piece of cake, Jackitysam. Advance the cohorts! Hup!"
And then, the entire army dies beneath a withering hail of the pointiest arrows the world had ever seen."
~Siamese~