moxque ex aggeribus quos erexerunt Romani, idem Persae propugnaculis insistentes, sagittis incessebantur, et fundis telisque igniferis, quae per tegumenta turrium volitantia, paratis qui restinguerent, plerumque irrita labebantur.
Translation :
Then those same Persians, when they had taken their place on the bulwarks were assailed from the mounds, which the Romans had raised, with arrows, sling-shots, and fiery darts, which, however, though they flew through the coverings of the towers, for the most part fell without effect, since there were men at hand to put out the fires.
Edition :
Ammianus Marcellinus. With An English Translation. John C. Rolfe, Ph.D., Litt.D. Cambridge. Cambridge, Mass., Harvard University Press; London, William Heinemann, Ltd. 1935-1940.