Tactical battles for city attacks should allow the defender to utilize the city's defenses and the attacker should have the option to build a greater variety of seige engines.

Example:

• Fortress Wall - Archers attack from behind the wall, and are immune to attack by non-ranged weapons
• Units inside walls are protected from non-ranged units

Example;

• Battering Ram - impervious to archer attacks, can destroy hedge wall segment in 1 attack, fortification wall in 2 attacks (fortification gate in 1 attack) fortress wall segment in 4 attacks, fortress gate in 2 attacks.
• Siege Tower - If moved adjacent to a wall segment attacking units can move through the seige tower past the defender's wall.

Your city is being attacked. 4  seige towers and 2 battering rams are rolling towards the city walls. Do you send forces out the gate to attack the seige towers and battering rams or do you wait to confront the attackers once they have breached the walls?