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Use "ballistae" in a sentence
"All along the wall, bows drew taut and ballistae creaked and catapults strained."
"Metal detector hobbyists working under the watchful eye of Loenne and her team located over 600 metal objects, from Roman sandal nails to arrowheads and six-inch long iron spear points that once capped javelins fired from ballistae, a sort of giant crossbow."
"Though it seemed to me that this was the time for armies, for catapults and ballistae and engines of waranything to take the Scorpion2s attention from yours trulythe task ahead of us began with twenty of us, and twenty of us only."