The list of units
Primitive artillery, catapults are devastating siege weapons in Ancient Times. They are used to bombard city defenses to soften the attack for accompanying soldiers. Catapults have no attack or defense power, so they should be protected by an escort. Finally, they are wheeled so they may not enter mountains or jungles unless following a road.
The catapult was one of the earliest forms of artillery. It was a large mechanical arm that propelled heavy stones and other missiles from a great distance, battering down walls and inflicting damage on buildings and defenders. Though cumbersome and nearly useless on the battlefield, the catapult was an effective weapon for siege operations.