Counterweight trebuchet

Timeline

1. c. 1000–1150Byzantine and Islamic worlds · Eastern MediterraneanByzantine and Islamic engineers had mastered various lever-type stone-throwing engines; early forms of the counterweight principle reached Western Europe through trade and warfare contacts, laying the groundwork for Europe's independent development.
2. c. 1150–1250Western Europe · Western EuropeEuropean craftsmen improved the counterweight arm structure and throwing mechanism, producing giant counterweight trebuchets that could be disassembled for transport and assembled on site, with range and projectile weight far exceeding torsion engines.
3. c. 1200–1300siege battlefields of the Levant · LevantCrusaders and Islamic forces used counterweight trebuchets extensively against each other in sieges such as Acre and Damascus; the scale of the engines and the engineering organization reached a medieval peak, profoundly changing castle defensive design.
4. c. 1400–1500European battlefields · EuropeGunpowder cannon demonstrated greater destructive power and mobility in sieges such as that of Constantinople; counterweight trebuchets gradually withdrew from actual combat, retaining only value in engineering history and reconstruction displays.