Quote Originally Posted by Slaists
once a spy enters an enemy's city, a parchment that comes up says that he has a certain chance of opening the gate. has anyone seen this actually take place? how does it happen? does one have to issue a command to the spy to open the gate or a try (roll) takes place automatically after an army assaults the settlement?
When you go to attack the settlement you will see a picture of an open gate on the screen where you can build seige equipment.

On cities with stone walls however you must still use ladders and such to capture the gate before sending your men through or else theyll be showered in hot oil.