Upgrading the castle allows for more military units at the same time.
Sending a Thief into an enemy Castle will give the player them their vision.
When achieving the promotion Sheriff, you are able to change the Soldiers' pay via the castle, allowing you to increase/decrease their strength.
- Even though soldiers are only unlocked after Sheriff, (since military buildings are unlocked after Sheriff) there is still a soldier's limit.
- It has different variations depending on the climate of the map.