Citadel
-Fortress-
A fortress or strongly fortified building in or near a city, a place of refuge
-Defender-
A strong defender of a particular way of life or principle
Intelligence
-Ability to think and learn-
The ability to learn facts & skills and apply them, especially when this ability is highly developed
-Secret information-
Information about secret plans or activities, especially those of foreign governments, the armed forces, business enemies, or criminals