11. Later the Romans used ballista catapults on their warships. 12. It was discharged by a ballista as if it were a heavy dart. 13. Ballistas or springalds were siege engines that worked on the same principles as crossbows.14. Talent ballista ( 26 kg weight projectile ). 15. Then Gallienus invited Odenathus to turn against his former allies, Ballista and Quietus. 16. ;Ballista : Ballistae were similar to giant crossbows and were designed to work through torsion. 17. There, ballistas and catapults lay in waiting, and drove the Goths back with great loss. 18. The term " robustness testing " was first used by the Ballista project at Carnegie Mellon University. 19. Turning his thoughts to the immediate future, Ballista leads his small party away from the sack. 20. As the Macedonian soldiers crank the ballista , birds fly off, warning the Huns off something wrong.
