Authors:

From the exterior face of the wall towers must be projected, from which an approaching enemy may be annoyed by weapons, from the embrasures of those towers, right and left.

Marcus VITRUVIUS POLLIO, Joseph GWILT (1826). “The Architecture of M. Vitruvius Pollio in Ten Books, Translated from the Latin by J. Gwilt”, p.21
From the exterior face of the wall towers must be projected, from which an approaching enemy may be annoyed by weapons, from the embrasures of those towers, right and left.