In time, however, the Romans scaled the outside wall, and then, pitching their camp between this and the second circuit, proceeded to assault the latter. But here they found the conditions of fighting different; for now that all the besieged had retired behind the second wall, its defence proved an easier matter because its circuit was shorter.
Edition :
Dio's Roman History. Cassius Dio Cocceianus. Earnest Cary. Herbert Baldwin Foster. William Heinemann, Harvard University Press. London; New York. 1914-.