Attack formation hint:

For this to work, you must have Towers, Walls, Auxiliary
Infantry.While playing Caesar III in a map with military
action, build Auxiliary Infantry. When you have an 
opponent who can only attack hand-to-hand like the 
Carthaginians, send your infantry out of the city walls.
Select them in a formation in which is perpendicular to
the angle of attack (like a T, where the top of the 
letter T is your infantry and the | part of the T is 
the direction the enemy army is moving.)

As the enemy draws closer, move your infantry away from
their current position and change the formation, once 
again, so they are perpendicular to the enemy. Continue
to do this until the enemy is dead (this works really 
well only with small armies of 1-30 or so).

If you don't understand this, here's why it works:  
if you have enough towers, they will continue to fire 
upon the enemy. Because your Spearmen are fast, they 
can move well. The enemy can't touch them, but your 
towers can, so they are constantly losing morale and 
men. That's why it works. (Note: This will also work 
well with Horsemen, who are even faster, but don't 
get into any hand-to-hand combat with them.)

by Gary