Settings: The Neck and Moat Callin
Anyone attempting to enter the North from the South, on land, has to go through the marshy swampland known as The Neck. And in the Neck sits Moat Cailin, a ruined fortress consisting of three intact towers, the first line of defense against any southern army. To reach the North, the invading army has to pass through Moat Cailin – there is no way to bypass it if the army travels by land. And since the ground is not firm enough for the deployment of siege weapons, that means that the invading army will be exposed to missile fire from archers stationed amongst the three towers – it is said that a hundred or so archers can hold off an army many, many times its own size.