We have no direct evidence to prove when humans invented these projection devices. King Samanisi II of Assyria (859-825 BC) seems to have no such tools. Because Balawat (bal? 0? 9wat) The bronze gate of the palace is engraved with a relief describing his struggle, in which the offensive and defensive equipment is clearly described, but this kind of projection equipment is not seen.

The earliest mentioned projection instrument can be found in the Bible, which records King Uzziah (reigned from 808-9 BC to 756-7 BC). "(King Uzziah) also made skillful craftsmen make machines in Jerusalem and put them on towers and turrets to shoot arrows and send stones. Uzziah's reputation spread far and wide. Because he got a lot of help and was very strong. " In Jerusalem, he made skillful craftsmen make machines and put them on towers and corner towers to shoot arrows and send stones. His name spread far and wide overseas; He was very strong because he got wonderful help. ”]

Dior Dorus tells us that this kind of projection device first appeared around 400 BC, when dionis Hughes (405-367 BC), the tyrant of Syracuse, organized an expedition to Carthage (397 BC). Among the experts collected from all over the world, there is a genius who designed a mechanical device that can project stones and javelins. Many years after Dionysius's rule, until14th century, military historians always mentioned projectiles.

However, it was not until Philip of Macedonia (360-336 BC) and his son Alexander the Great (336-323 BC) that the projection equipment was carefully improved and its role in the war was fully recognized.