In the second century Ad, the Antonine Wall was built as the northwestern border of the Roman Empire. It had long been known that the wall ran through Bearsden, a town a short journey from Glasgow. But in the 1970s archaeologists, among them David Breeze, were asked to run trial excavations in the search for a fort. Scholar of Hadrian's Wall, the Antonine Wall and the Roman army, David joins Tristan to take us through the findings at Bearsden, from bath house to barracks. David and Tristan then turn their attention to Hadrian’s wall, 100 miles south, and its initial construction.