But they inflicted the greatest damage on their assailants when these approached the wall, and much more still after they had broken down a small portion of it; for they hurled down upon them, among things, the bituminous naphtha, of which I wrote above, and consumed the engines and all the soldiers on whom it fell.
Edition :
Dio's Roman History. Cassius Dio Cocceianus. Earnest Cary. Herbert Baldwin Foster. William Heinemann, Harvard University Press. London; New York. 1914-.