"Arsenals radiate lines of communication vertically, horizontally, and diagonally. In addition, transmission relays propagate any line of communication aimed at

"Arsenals radiate lines of communication vertically, horizontally, and diagonally. In addition, transmission relays propagate any line of communication aimed at them. All units must remain in direct connection with their own lines of communication, or be adjacent to a friendly unit in communication. If stranded, a unit goes offline and becomes inert."