Warlord Marsallas with an "Onager" style catapult. This type of siege engine was used by the Roman Legions when assaulting walls and fortifications. "Onager" means "wildass" in latin and refers to the kicking action of the machine when it was discharged. It is a simpler and less complex form of the "Ballista" type catapult; which Rome had adopted from the Greeks. It utilizes a large arm powered by one horizontal skein of rope or gut; whereas the Ballista had a more complex "cross-bow" arrangement powered by two vertical skeins.
Consult the "Weapons" page of the website for more details.