Try archer heavy armies if the faction has good ones. It worked for me.
The outlines of the strategy.
Wooden walls:
Line up 10-14 units of archers along the red line (you may have to use a deeper rank to concentrate fire). If you have onagers have them demoish nearby towers.
Battle begins. Battering rams forward. Archers do their stuff. After a while the AI moves its remaining units to the plaza area, away from your archers. Infantry enters the cleared area of the town. Archers move closer (if the towers are down). AI tries to get to your infantry - your archers are in business again. Archers are out of ammo and join the infantry. All the crowd moves to plaza. Usually there are only a few shaken enemy units to defeat by the moment.
Stone walls:
Similar, but siege towers instead of rams, and the "archers move closer" bit should be replaced with "archers are placed on top of the captured walls."
I reckon it is not historical, but still works :)
By the way, preferably you need the battle timer disabled, as it may take longer than 30 minutes.
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