Why Roman fortifications followed roads and logistics

In a short general-history tangent, Hadrian's Wall illustrates why Roman remains are visible and why Roman military construction differed from many local British earthworks. Earth fortifications could suit smaller local warfare, while Rome's large manoeuvring armies relied on roads, planned supply lines, and permanent defensive systems. Stone walls and forts therefore belonged to a wider infrastructure that moved and sustained legions across long distances. The example sets up the video's return to Antony, whose weakness in logistics and infrastructure became operationally important at Actium.