But the Romans suffered most hardship from the lack of water; for their supply was of poor quality and had to be brought from a distance. The Jews found in their underground passages a source of strength; for they had these tunnels dug from inside the city and extending out under the walls to distant points in the country, and going out through them, they would attack the Romans' water-carriers and harass any scattered detachments. But Titus stopped up all these passages. In the course of these operations many on both sides were wounded and killed.
Edition :
Dio's Roman History. Cassius Dio Cocceianus. Earnest Cary. Herbert Baldwin Foster. William Heinemann, Harvard University Press. London; New York. 1914-.