Note 9 — Chapter I · ROME UNDER THE KINGS.
Reading edition
Titus Livius I. 44.—Dionysius of Halicarnassus, speaking of the portion of the rampart between the Porta Æsquilina and the Porta Collina, says, “Rome is fortified by a fosse thirty feet deep and a hundred or more wide in the narrowest part. Above this fosse rises a wall supported internally by a lofty and wide terrace, so that it cannot be shaken by battering rams, or overthrown by undermining.” (Antiq. Roman., IX. 68.)