I used to build long palisades of wood; the AI would do some path-finding, and discover the gap in the fence around the back of my base. It would then send a s

I used to build long palisades of wood; the AI would do some path-finding, and discover the gap in the fence around the back of my base. It would then send a steady stream of units to attack me, but they'd walk in single file along the wall towards the gap...