Photograph of French troopers using a spring, or compound spring powered tension catapult to hurl grenades across no man's land and into enemy trenches.

Grenade throwing ballista on the Western Front in World War I. Bent steel springs on this modern torsion catapult replace the twisted cord skein of its ancient ancestor, the Roman stone throwing ballista.

World War 1 Imperial German Army troops employing a grenade Wurfmaschine, a compound spring catapult with a sling related to the ancient Roman onager. 

More Siege Scenes: 

Plan # TP6-TSM	Build a Working Model Highland Trebuchet Price $12.95 FREE Shipping Read More >
Plan # BP1-TSM	Build a Working Model Roman Ballista Price $12.95 FREE Shipping Read More >
Plan # TP5-TSM	Build a Working Model daVinci Trebuchet Price $12.95 FREE Shipping Read More >
Plan # RC1-TSM	Build a Working Model Repeating Crossbow Price $12.95 FREE Shipping Read More >
Plan # CP1-TSM	Build a Statistical Catapult Price $12.95 FREE Shipping Read More >
Plan # TP3-TSM	Build a Golf Ball Trebuchet Price $12.95 FREE Shipping Read More >
Plan # CP2-TSM	Build a daVinci Spring Catapult Price $12.95 FREE Shipping Read More >
Plan # TP2-TSM	Build a Tennis Ball Trebuchet Price $12.95 FREE Shipping Read More >
Plan # MP1-TSM	Build a Working Mangonel Catapult Price $12.95 FREE Shipping Read More >
Plan # OP1-TSM	Build a Working Roman Catapult Price $12.95 FREE Shipping Read More >
Plan # TP1-TSM	Build a Working Model Medieval Trebuchet Price $12.95 FREE Shipping Read More >
Plan # WS1-TSM	Build an Archimedes Water Screw Price $12.95 FREE Shipping Read More >
Plan # TP4-TSM	Build a Working Model Stirling Trebuchet Price $12.95 FREE Shipping Read More >
Plan # TP7-TSM	Build a Working Model Trebuchet Price $12.95 FREE Shipping Read More >