- Only friendly units and Leaders allied to the city may move, retreat or evade onto or through a hex with a city gate. The gate is considered open and will not prevent these friendly unit movements.
- Enemy units and lone Leaders of the city may not move, retreat or evade onto or through a hex with a city gate. The gate is considered closed and will prevent these movements. A city gate that is closed is treated as impassable terrain for enemy units and lone enemy Leaders.
- An enemy unit must first successfully storm the city gate to move onto a city gate hex. To storm a gate, an ordered unit must be in an adjacent hex to the gate and be eligible to battle in Close Combat. The unit will roll two dice against the gate. When one or more swords symbols are rolled the gate is opened, even from units that normally do not score a hit in Close Combat on sword rolls. A unit with an attached Leader will open the gate when one of more swords or Leader symbols are rolled.
- Once a gate is successfully stormed the gate will remain open. Remove the city gate tile from the battlefield. The unit that opened the gate may Momentum Advance onto the hex, but the unit may not Bonus Close Combat.
- A friendly unit of the city that occupies a city gate hex may be attacked. If the unit on the gate hex is eliminated or retreats from the gate hex the attacking unit may Momentum Advance onto the hex, but the unit may not Bonus Close Combat. The gate in this case is considered stormed and the gate will remain open. Remove the city gate tile from the battlefield.