Early Medieval Artillery

  
In the age of empires, where written history begins, bronze and then iron swords and axes were the weapons of  close combat while the bow and arrow, crossbow and the spear, were the weapons of lethality at a distance.  As defenders began to invest in high walls to stop attackers, and especially their horses 1), a new category of weapon entered the inventory (along with infantry, and cavalry): the artillery.  Within the generic name catapult are two types of weapons, both called trebuchet, as well as torsion based stone throwers.   The trebuchets used the properties of a lever to convert a large force moving slowly through a small arc into an equivalent force moving a small mass through the same (angular) arc at a higher velocity.   The traction trebuchet used soldiers pulling ropes along with unequal lever arms and a sling to launch stones.  The counterweight trebuchet used a counterweight and unequal lever arms.  The tension was stored by pulling the throwing arm down before launch (raising the counterweight).  The traction trebuchet began to be used about 400 BC in China, and was used by King Richard the Lion Hearted at the siege of acre in 1191 (during the crusades).  The mongols and the Muslims also used them after a rapid learning experience.
There was also the magonal which was based on using the torsion of ropes of hair as a spring, and the
balista
a giant crossbow dating from Roman times. 

                            Specs
                            Weapon                                    Appearance         Payload          Range
  
                            Traction Trebuchet                400 BC                   100 kg            30 - 60 m        
 
                            Counterweight Trebuchet     1100 AD                50-100 kg        300 m               
                   
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1) The Great Wall of China was to prevent the passage of horses.