It was he who stretched the skeins of the ballistas.
"Salammbo" by Gustave Flaubert
An army might beat the stony face with ballista and ram, and be laughed at.
"Ben-Hur: A Tale of the Christ" by Lew Wallace
The air was full of flints hurled to the walls by ballistas and mangonels.
"Peter the Hermit" by Daniel A. Goodsell
They were made in various forms, and were called catapultas, ballistas, maginalls, and by other such names.
"Richard I" by Jacob Abbott
Up in their high emplacements, the big ballistas creaked and thrummed.
"Black Amazon of Mars" by Leigh Brackett
The ballista was considerably larger and more expensive than this.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5" by Various
Various names were applied to these weapons, the chief of which were the ballista and the catapult.
"Great Inventions and Discoveries" by Willis Duff Piercy
The catapults were reenforced by the ballistae.
"The Golden Hope" by Robert H. Fuller
There are heavy cross-bows, ballistas, a catapult, and other mediaeval machinery of battle.
"The Complete Opera Book" by Gustav Kobbé