Every ruler, build a castle, I am sure that none of the enemy spy will not be able to climb over the wall, but the enemy has invented an amazing tool - a catapult. With this tool, you can not only destroy the strengthening of the castle, but to throw spies. That the enemy has not got into the courtyard of the castle, you will have to manually remove the enemy soldiers. Become patrol and prevent invasion of anyone in the territory controlled by your fortress. Consider a spy - and the mission failed!