Built in the late third century BC, the fortifications at Perge were revolutionary for their time. The curtain walls were of two structural types; single solid wall, and a wall with buttresses, arches, a mural gallery, and embrasures for arrow-firing devices. This illustration shows the latter type, from the interior and exterior. The wall provides two levels for the defense; an upper wall-walk, and a mural gallery. The former was wide enough to accommodate a three span catapult, but the mural gallery was considerably narrower; there is only room for archers. It is possible however, that temporary wooden planking was placed between the arches during a siege, allowing additional arrow-firing devices to be mounted here.
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