The Wall is the Wall: Why Fortresses Fail
Link: The Wall is the Wall: Why Fortresses Fail: "…and there he corrected many abuses and was the first to construct a wall, eighty miles in length, which was to separate the barbarians from the Romans."
Link: The Wall is the Wall: Why Fortresses Fail: "…and there he corrected many abuses and was the first to construct a wall, eighty miles in length, which was to separate the barbarians from the Romans."