👉 Ballista is a type of artillery weapon that was used in the Battle of Ypres, Belgium during World War I. It consisted of a cylindrical barrel with a large, rounded end and a small, flared end. The ballista fired a 24-pound (10.8-kilogram) charge at a speed of approximately 300 meters per second (980 feet per second). Ballist was also known as the "pump gun" because it could be