nbsp 0183 32 The northern and southern walls measured respectively 175 yards and the western and eastern walls 140 yards covering thus an area of 5 acres and 10 perches or 24 500 square yards The eastern wall in 1765 stood still 6 feet to 7 feet in height and was lowered to 3 yards to 4 feet 80 yards away from its northern termination where the Porta pr 230 toria was placed