Quote Originally Posted by C-F
Summary, cavalry good against archers; spearmen good against cavalry; archers good against spearmen. Now, where does that leave all the other units that you can build (arcani, hastatii, town watch to name a few) and which of the categoties do they fall into ??? And what about the formations and tactics - oh my...
I guess I left out a category of troops you could call "swords" - ie heavy infantry such as hastati and princeps. They are good against spears; fair against cavalry.

Arcani are a novelty "commando" style unit - I don't build them.

Town watch are just garrison troops, like peasants, to maintain order but not fight.

In terms of tactics, you are best looking at frogbeastegg's guide. Perhaps the key concept is flanking - hold them by the nose, kick them in the rear as the centurion advisor put it. I tend to form a line of swords/spears backed by missiles and when the enemy is engaged, try to work my cavalry round the flanks and fall upon their rear. For that to work, you have to neutralise the enemy's cav - e.g. waiting until it is committed or smashing it with your own cav.