Take a look at a castle, any castle. Now break down the key elements that make it a castle. They haven't changed in a thousand years. One... location. A site on high ground that commands
the territory as far as the eye can see. Two... protection. Big walls. Walls strong enough to withstand a frontal attack. Three... a garrison. Men who are trained and willing to kill. Four: a flag. You tell your men, "You're soldiers, and that's our flag." You tell them, "Nobody takes our flag." One step forward. Forward! And you raise that flag so it flies high where everyone can see it. Now you've got yourself a castle.