This is a multiplayer map. Don't break the wall up north, hostile wildlife!
The idea of this map is to release the neutral AI wildlife as a desperate move. In the original game, the AI will always attack north first (the civilian village at the north was intended to slow them down before they focus on the players) and the gunboat at the south was meant to be a sort of danger so the south-most areas are not safe too. This AI behavior is changed in the remastered but I still keep the design.