"The curtains of Perge - Built in the late 3rd century BC, the fortifications of Perge were revolutionary for their time. The curtains are of two structural types: a simple solid wall, and a wall with buttresses, arches, a mural gallery and embrasures for arrow-firing devices"
"The curtains at Side" The fortifications at Side, which possibly date froma little later than those at Perge, were constructed with the same observance of the latter’s main principle – to provide formaximum firepower. In Side, however, the architect was a creative professional: he devised three complex versions of the curtain, thus succeeding in obtaining an additional increase in their firepower
TRAVEL NORTH - 34: WALKING ROMAN REMAINS, Hadrian's Wall, Mile Forts and a Volcanic Plate