Spies revealed invasion plans!?

[macsen rufus]

I don't care if spies can open gate of enemy fort/keep/castle/citadel/fortress as I never assault them through gate. I always destroy walls and then attack. Gate is small and AI always put some hard to kill unit in gate.

@ Duke of Serbia - you use spies to end the siege on the campaign map, not the battle map. Drop a spy onto the castle, then if he succeeds, you will get a message saying "Your agents opened the gates at night. Great victory with few losses" or similar. It seems the longer the spy has been in the province, the more likely he is to open the gate (but it might be the longer you wait, the fewer defenders there are to catch him as well).