Mangonel n. : A military engine formerly used for throwing stones and javelins.

Example:
Instructions for how to build a Mangonel?

Taxonomy
mangonel, projectiles, walls, free encyclopedia, trebuchet, bucket, counterweight, onager, mangonels, sling, demoralize, tactic, 01-12, Paul, Robert I. Burns, search, illustration, Greco-Latin.

Defination from the web:
mangonel is often used as the name of a Medieval form of onager, though there is little evidence for this historically. ... The mangonel threw projectiles on a lower trajectory and at a higher velocity than the trebuchet with the intention of destroying walls, rather ...