A small, but impregnable (in a completed state) outpost and walls based on it. A permanent connection to a reliable power grid is required (There are no reliable power sources of their own) and, accordingly, the railway. The walls are not capable of deterring enemies from the rear, but the Wall hub has a circular defense and, in case of an error, is able to restrain an offensive from the rear, and independently resume construction afterward. The construction and dismantling supply stations are combined into one unit for the delivery of materials by logistics robots, but no one forbids placing the stations separately, in convenient places, including with loading using conveyors (but this is a difficult way). The artillery train supply station is presented in the basic version and requires a stacker for trains, a source of light oil, as well as with the help of conveyors, or with the help of logistics robots, the supply of artillery shells ~ 300 per minute, for continuous, active expansion